Write a Formal Complaint About a Service or Tradesperson

A builder left the job half done, or a company billed you wrong, and the polite phone calls went nowhere. This writes a formal complaint letter that is firm without being a rant, sets out the issue, what you want done and the deadline, and references the relevant rights, so it lands as a letter they take seriously rather than bin.

<context>
You have had a poor experience with {SERVICE_PROVIDER} (e.g. a builder, letting agent, utility company, or retailer). The issue is [describe: e.g. unfinished work / incorrect billing / failure to honour a warranty]. You have already [tried to resolve informally / not yet contacted them]. You want a firm but professional letter.
</context>

<task>
**Write a formal complaint letter that gets results:**
1. Open with a factual summary of the issue: dates, amounts, what was promised vs what happened
2. State clearly what remedy you are seeking and by what deadline
3. Reference the relevant consumer rights: Consumer Rights Act 2015, or sector-specific regulation
4. Escalation path: if unresolved, where does this go next (ombudsman, trading standards, small claims)?
5. Tone: firm and factual, not emotional, and explain why this is more effective
</task>

<output_format>
- Complaint letter (ready to send, with [placeholders] for your specific details)
- Your rights summary (2-3 bullet points, specific to this type of complaint)
- Escalation path (one sentence per step: company, then ombudsman, then small claims)
- Tone note (two sentences on why professional tone works better)
</output_format>