尊敬的经理,
Dear Manager\To whom it may concern,
我写这封信是要投诉你部门糟糕的服务。你的员工在运输过程中将我的包裹弄坏了。
I am writing to express my disappointment about the poor\terrible\awful service of your company. Your staff has broken\damaged my parcel during transportation.
当我打电话去服务台时，接电话的姑娘非常不耐烦而且很粗鲁。一开始，不断打断我的投诉，接着她又认为错误在我。
When I phoned your after-sale service center, the girl who answered my phone was impatient and rude. First, she impolitely interrupted my complaint several times. Then she argued that the fault was on myself\my own.
我希望能在最短的时间内收到我的新包裹，并立即接到你们的道歉。此外，我希望你能严肃的看待这个问题，并努力防止类似的事情再度发生。
I want my new parcel to be received in the shortest time, and your immediate apology is required. Furthermore, I hope you will consider this matter seriously and make an effort\do your best\do your utmost to prevent the recurrence of that\the similar issue happening again.
敬上
张伟
Cordially yours,
Zhangwei
模板句子：
1.I am writing to complain that------
2.I wish to draw your attention to the problem\issue.
3.I am sorry to trouble you but I am afraid I have to make a serious complaint.
4.I understand you will give immediate attention to this letter.
5.I would like to have this matter settled\solved by the end of this week.