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Phone contract poor service complaint letter

Faults, slow speeds or no service? This formal phone contract complaint asks your provider to fix it, credit your account and give you a reference, starting the 6-week clock for the free complaint scheme (CISAS or the Communications Ombudsman).

1. Add your details

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2. Copy, print or download

Tips

• Send it through your provider's complaints email, web form or post, and keep a copy with the date you sent it.
• Note the date: you can usually go to the free complaint scheme (CISAS or the Communications Ombudsman) after 6 weeks, or sooner with a deadlock letter.

Sources

• Ofcom: Telecoms price rises – what are your rights?
• Communications Ombudsman
• CISAS

Last checked 02/11/2026. This is a template with general information, not legal or financial advice. Check your own contract and the linked pages before you send it.

Other phone contract letters

• Phone contract price rise complaint letter
• Out-of-contract phone contract complaint letter
• Phone contract billing error complaint letter
• Letter to cancel your phone contract