Write a letter complaining about the faulty product.

This is to inform you that 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 details of the transaction).

However, I am sorry to inform you that your product (or service) has not performed well because (state the problem). I would appreciate it highly if you take immediate steps to resolve the problem (state the specific action you want). I am also enclosing copies of my records (receipts, guarantees, warranties, cancelled checks, contracts, model and serial numbers, etc.).

I shall look forward to your reply and seek an immediate resolution to my problem. I shall wait (set a time limit) before seeking third-party assistance. Kindly contact me at the above address or by phone (phone number) in case you have any queries.

Sincerely,