Your name, address
Date
Business/company name and address
Dear Sir/Madam:
This is to inform you that on (date of the contract), I (purchased/rented/ leased) a (product/service) from you at a price of (details about model/serial number, amount etc.).
I would like to bring to your attention that the purchase agreement was made at your store located at (give details about the location of the store, the person you dealt with and any particular or relevant representations made to you about the product, goods or services). However, I am facing problem with it (state your problem).
I would appreciate it highly if you work towards resolving my problem in the following manner (state how you want it to be resolved - by mending the product or getting a suitable replacement).
I shall look forward to your immediate reply. In case you have any queries, you can contact me at my home telephone number at (phone no and time for calling).
Yours truly,