[Your letterhead, if desired; if not, your return address]

[Date of letter-month, day, and year]

[Recipient's first and last names]
[Company name]
[Street or P.O. box address]
[City, State ZIP code]

Dear [recipient's name]:

I brought my 1999 Toyota Camry to your auto mechanic shop on August 18, 2010 for some brake and tuneup work. I picked up my car on August 19 and paid in full at that time. It is now two weeks after that date, and I continue to experience similar operational problems when I drive my car as I had before paying the large amount of money to have you complete the repairs. I am thus frustrated that this problem has not been completely resolved, as I had anticipated.

Please contact me right away so that we can clear up this matter to my satisfaction. I look forward to hearing from you and to resolving the car problems, and thank you for promptly responding to my letter.

Sincerely,

[Signature]

[Sender's first and last names]