Write a letter complaining about the faulty Product.

Dear Sir

This is to bring to your attention that on (date), I purchased a music system with the serial no. ______ from (location, date, and other important details of the transaction). However, I am sorry to informI am disappointed with the purchased product due to following reasons. Firstly, its sound system (state the problem) is not working well. Secondly, its remote controller system is also having problems.

Therefore, I would appreciate if you replace the system so that my problem can be resolved. I shall look forward to your reply and a resolution to my problem within a week before seeking third-party assistance. Kindly contact me at the above address or by phone (phone no.).

Sincerely,