Use the given phrases and your own ideas to write an email of complaint

You recently bought a faulty product from a shop. When you took it back to exchange it, the sales assistant was rude to you. Write an email of complaint to the head office of the shop (120-180 words). Explain why you are unhappy.

Reason for writing: I am writing to complain about .../ I want to express my dissatisfaction with...

Your complaints: I bought..., but..., To make matters worse...

Your demands: I would appreciate if you...

Closing remarks: I hope that you will look into this matter.../ I look forward to...