The car garage charged you for work it didn't fix. Here's the letter.

You paid the garage, drove off, and the same fault was back within days. Give it the garage, the date, your vehicle and reg, the amount and the fault, and it writes a complaint under the Consumer Rights Act 2015, which says services must be done with reasonable care and skill, requesting a free repeat repair or a price reduction.

Draft a complaint letter to [garage name] about a repair carried out on [date] to my [vehicle make and model], registration [reg]. I was charged [amount] to fix [original fault]. The same fault recurred within [timeframe]. Under the Consumer Rights Act 2015, services must be carried out with reasonable care and skill and the right to a repeat performance or price reduction applies. Request that they either re-do the repair at no charge by [deadline] or refund [amount]. State that if they decline I will seek an independent assessment and pursue the difference through small claims.