- A good complaint letter includes your account details, a dated timeline, the evidence, and the specific remedy you want.
- Keep the tone factual and firm rather than angry, and put everything in writing for a record.
- Providers have a complaints process and a defined period to respond before you can escalate.
- After six weeks without resolution, or at deadlock, you can take the complaint to the ombudsman.
A well-written complaint letter is more effective than hours on the phone, because it creates a record, forces a considered response, and starts the clock toward escalation if the provider does not resolve things. The structure matters: a clear, factual letter that names the remedy you want is far harder to fob off than a vague grievance.
What to include
Open with your account details so the provider can identify you immediately. Set out the problem as a dated timeline, when it started, what happened, what you have already done. Reference your evidence, speed logs, call references, engineer dates. Then state clearly the remedy you want, whether that is a repair, compensation, a refund or release from the contract. Specificity is what makes a letter actionable.
Tone and format
Keep the tone factual and firm, not angry; a calm, evidenced letter is taken more seriously than an emotional one. Use clear paragraphs or short numbered points, and keep it concise. Put it in writing, by email or letter, so there is a record, and keep a copy. Avoid burying the key request, the remedy you want, in a long narrative.
How to send and follow up
Send it through the provider's official complaints channel, and keep proof of sending. Note the date, because the provider's response window runs from when you complain. If you do not get a satisfactory response, follow up in writing, referencing your original complaint and the time elapsed, and state that you will escalate if it is not resolved.
Complaint letter structure
| Section | What to put |
|---|---|
| Account details | Name, account number, address |
| The problem | Dated timeline of what happened |
| Evidence | Reference speed logs, call records, dates |
| Remedy requested | Exactly what you want done |
| Next step | State you will escalate if unresolved |
Requesting a deadlock letter
If the provider's response is unsatisfactory and you have reached an impasse, you can ask for a deadlock letter, which confirms the provider's final position and lets you take the complaint to the ombudsman without waiting the full six weeks. If the provider will not issue one, you can still escalate once six weeks have passed since you first complained. Either way, your documented complaint is the foundation of that escalation.
Frequently asked questions
What should a broadband complaint letter include?
Your account details, the problem set out as a dated timeline, references to your evidence such as speed logs and call records, and a clear statement of the remedy you want, whether a repair, compensation, refund or release from the contract. Specificity makes it actionable.
How should I send a formal broadband complaint?
Through the provider's official complaints channel, in writing by email or letter so there is a record, keeping a copy and proof of sending. Note the date, because the provider's response window and your six-week escalation clock run from when you complain.
How long does my ISP have to respond?
Providers operate a complaints process with a defined period to respond. If your complaint is not resolved after six weeks, or you reach deadlock sooner, you can escalate to the ombudsman. Check your provider's complaints code for its specific response timescales.
What remedy can I ask for in a broadband complaint?
Depending on the issue, you might ask for a repair, compensation for loss of service or missed appointments, a refund of incorrect charges, or release from the contract where a speed guarantee is unmet. State the specific remedy clearly rather than just describing the problem.
What is a deadlock letter?
It is a letter from the provider confirming its final position when a complaint cannot be resolved. It lets you take the dispute to the ombudsman without waiting the full six weeks. If the provider will not issue one, you can still escalate once six weeks have passed.
