Dear Manager:

Yesterday, I bought a pen at your shop. When I arrived home, I started writing a letter but when I was writing the second word, the pen stopped working. Because of this, I decided to go to your shop. The sales assistant said that he could not change the pen because I did not have the receipt. I said that when I bought the pen, the other sales assistant did not give me a receipt. He told me that the shop would only change the pen if I wrote a letter. Would you mind changing the pen?
Yours Sincerely

Micaela Alquezar