【正确答案】Dear Manager，
   I am writing this letter to complain about a camera，which I bought in your department store last month when I was in Guangzhou on business. I took some pictures there with it. But when I got home and had the film developed，I found no pictures printed at all. I am very angry about it. I have already sent the camera back to you by post and strongly insist that you refund me as soon as possible.
     　　　　　　　　　　　　　　　　　　Yours faithfully，
  　     　　　　　　　　　　　　　　　　　 　　Wang Lan