(Your City, State, Zip)
(Name of Contact Person)
(City, State, Zip Code)
Dear (Contact Person):
On (date), I purchased (or had repaired) a (name of the product with the serial or model number or service performed). I made this purchase at (location, date, and other important details of the transaction).
Unfortunately, your product (or service) has not performed well (or the service was inadequate) because (state the problem).
Therefore, to resolve the problem, I would appreciate your (state the specific action you want). Enclosed are copies (copies, not originals) of my records (receipts, guarantees, warranties, cancelled checks, contracts, model and serial numbers, and any other documents).
I look forward to your reply and a resolution to my problem and will wait (set a time limit) before seeking third-party assistance. Please contact me at the above address or by phone (home or office numbers with area codes).