1) I’m writing to express my dissatisfaction about the coat which I bought last month in your store.
我写信向你投诉有关上个月我在你家店买的衣服的问题。
2) I am one of your customers. I’m writing to complain about one of your waiters’ improper and rude behaviors.
我是你的一个顾客。我想投诉你店里一个服务员的不礼貌而且粗鲁的行为。
3) I am most reluctant to complain, but...
4) I would like to draw your attention to the problem/fault that...
5) I wish to express my dissatisfaction/ disappointment about...
6) I hate to bring this up, but it is hard for me to understand...
7) I am really annoyed about...
8) I am sorry to trouble you but I am afraid I have to make a complaint about...
9) There are some problems with... that I wish to bring to your attention.
10) To improve the situation/ To solve the problem, it’s advisable for you to take the following suggestions.