The short version
A UK broadband complaint follows a predictable path: raise a formal complaint with the provider, give it up to eight weeks to resolve the issue, ask for a deadlock letter if it will not, then take the case to the approved ombudsman. The ombudsman is free, independent and can require a remedy. The hard part is not the process; it is keeping the evidence clean enough to make each step stick.
This guide walks through that path with the wording, dates and documents that matter. It applies to broadband, mobile and landline providers. Energy and water follow different schemes, which are covered in the energy complaints guide and the water complaints guide.
Before you call: build a two-minute evidence pack
Most complaints fail because the customer cannot prove what was promised. Before your first contact, collect:
| Evidence | Why it matters |
|---|---|
| Account number and service address | The provider cannot open a complaint without them. |
| Start date and pattern of the fault | Shows whether this is a one-off or a continuing failure. |
| Speed tests, router lights, error messages | Turns “it is slow” into a measurable problem. |
| Bills and payment dates | Needed for billing and refund complaints. |
| Previous contact dates, agent names and reference numbers | Proves you gave the provider a chance to fix it. |
| The outcome you want | Repair, credit, refund, release from contract or a combination. |
Write a two-line summary of the problem and the remedy you want. Use the same wording every time. Consistency makes it harder for a provider to reframe the issue as a new complaint.
Step 1: raise a formal complaint, not a support ticket
Call the customer service number or use the provider's online complaint form. The phrase that matters is “I want to raise a formal complaint.” A support ticket can be closed when the call ends. A formal complaint starts a clock and should produce a reference number.
Provider-specific contact routes:
- BT complaints and customer service
- Virgin Media complaints and customer service
- Vodafone UK complaints and customer service
Ask the agent to read the complaint back and confirm the reference in writing. If they will not send an email, record the date, time, agent name and what was said. A photograph of the chat or a forwarded SMS is better than a memory.
What to say on the first call
“I want to raise a formal complaint about [problem] at [address], account [number]. It started on [date]. I have [evidence]. I want [specific remedy]. Please give me the complaint reference and tell me when I will receive a response.”
Do not accept “we will look into it” as a resolution. Ask for a date and a named owner.
Step 2: use the eight-week window properly
Ofcom's complaint-handling rules give providers up to eight weeks to resolve a complaint. Many cases are fixed in days, but the eight-week mark matters because it unlocks the ombudsman if the provider has not resolved the issue.
Follow up in writing after about a week if there has been no substantive response. A holding reply is not a resolution. Ask three questions:
- What has the provider done so far?
- What is the remaining fix and when will it happen?
- If the provider is refusing, what is the reason in writing?
Keep a simple timeline:
| Date | What happened | Reference |
|---|---|---|
| Day 1 | Formal complaint raised by phone | Reference number |
| Day 3 | Engineer appointment promised | Appointment reference |
| Day 8 | No attendance; complained again | New reference or same case |
If the provider misses an agreed appointment or repair date, log it the same day. Those missed dates become evidence for both the complaint and any automatic compensation claim.
Step 3: ask for a deadlock letter
If the provider has made its final offer and you are not satisfied, ask for a deadlock letter. It sets out the provider's position and tells you which ombudsman scheme it belongs to.
You do not have to wait the full eight weeks when the provider has clearly refused to resolve the issue. A deadlock letter is the cleanest route, but it is not the only one: evidence that eight weeks have passed also unlocks the ombudsman.
Use this wording:
“I am not satisfied with the outcome of my complaint. Please issue a deadlock letter confirming your final position and the ombudsman scheme I can use. If you will not issue one, please confirm that in writing.”
If the provider refuses, keep the final email or transcript and note the date. The ombudsman can accept a case without a deadlock letter when the eight-week period has expired.
Step 4: take the case to the ombudsman
There are two approved schemes: the Communications Ombudsman and Ombudsman Services: Communications. Which one applies depends on the provider. The complaint page or deadlock letter must tell you.
The ombudsman service is free to the customer. Submit:
- The deadlock letter or evidence that eight weeks have passed.
- Your complaint reference and a short timeline.
- Evidence of the fault, the bills and the provider's responses.
- The remedy you want and why it is reasonable.
The ombudsman decides whether the provider's offer is fair. It can require an apology, a repair, a correction and a financial award. It usually aims to decide within 90 days, although simple cases can be faster. Its decision is binding on the provider for that complaint, but it does not stop you using a court for a separate legal claim.
How long each stage should take
| Stage | Typical timing | What to do if it slips |
|---|---|---|
| Provider acknowledges complaint | A few working days | Follow up in writing and keep the reference. |
| Provider investigates | Days to eight weeks | Ask for a written update every week. |
| Deadlock letter | Usually within days of request | If refused, wait out the eight weeks and escalate. |
| Ombudsman accepts case | Days to a few weeks | Check the portal and respond to information requests. |
| Ombudsman decision | Usually within 90 days | Ask for an update if the deadline passes. |
What a strong complaint looks like
Weak: “My broadband has been terrible for months and nobody helps.”
Strong: “On 3 March I reported a fault, reference 12345. An engineer was booked for 8 March and did not attend. On 9 March the provider promised a credit that did not appear. I want the fault fixed, the missed-appointment compensation applied and a written explanation.”
The strong version names dates, references, a specific failure and a specific remedy. It is also easier for an ombudsman to investigate.
Common mistakes to avoid
- Cancelling the direct debit. This creates a separate debt dispute and can damage your credit file.
- Accepting a goodwill credit without asking what it settles. A credit may be offered on condition that you close the complaint.
- Starting a new complaint every time you call. Keep one case and add updates to it.
- Sending a long emotional letter with no timeline. Lead with the facts and put the chronology in a table or list.
- Waiting silently. Follow up in writing so the eight-week timeline is documented.
- Refusing to use the provider's process. The ombudsman will usually send you back if you have not given the provider a chance.
If the provider says no
A refusal is not the end. Ask for the refusal in writing, with reasons. Then escalate to the ombudsman. If the issue is a legal breach rather than a service dispute, consider a letter before action and the small claims track. For a systemic problem affecting many customers, report it to Ofcom, although Ofcom does not resolve individual cases.
Frequently asked questions
Do I have to accept the ombudsman's decision?
The decision is binding on the provider, not on you. You can decline it and pursue a court claim, but you then lose the free dispute-resolution route for that complaint.
Can I escalate before eight weeks?
Yes, if the provider has issued a deadlock letter or clearly refused to resolve the complaint. Otherwise, wait for the eight-week mark or a final response.
Does complaining affect my service?
It should not. Providers must not disconnect you for making a complaint, but you remain responsible for undisputed charges. Keep paying the undisputed amount while the disputed amount is investigated.
What if I have already left the provider?
You can still complain about the service you received and about the final bill. Keep your account number and final bill, and use the same escalation route.
Is the ombudsman really free?
Yes. The provider pays for the scheme. Be careful with claims companies that charge a percentage of any award; you can submit the complaint yourself.
The bottom line
Raise a formal complaint, document every date and promise, wait out the eight weeks only if you must, and escalate with a clear chronology and a specific remedy. Most successful broadband complaints are not won by arguing harder; they are won by making the paper trail impossible to ignore.
Compare provider contact routes
Open the provider pages for phone numbers, complaint steps and letter templates.
This guide is general information, not legal advice. Rules and complaint deadlines change. Confirm the current process with the provider or regulator before relying on a deadline. Read our editorial policy.