第一部分：說明投訴問題

I must complain about…

I am not satisfied with…

I feel something should be done about…

I am writing to inform(告知，代替tell)you that I find…unsatisfactory…

I am writing to express/ air dissatisfaction/ disappointment/ concern regarding …

第二部分：描述具體情況

The noise disturbs my sleep so that I can't concentrate during the work time, and as a result, I have made several mistakes these days.

For me this environment is very difficult to make studies and I need a quiet room.

第三部分：期待解決方案

I expect to hear from you soon.

Please give this matter your immediate attention.

I would be very grateful (感激，代替thanks)if you could look into the matter as soon as possible. And I am looking forward to an early reply.

It is high time you took some measures to solve…

I hope you will take steps to rectify(糾正、改善，代替improve) this situation soon.

I believe you will take my complaints seriously. I would ask you to give back my money, or I would file my complaint(投訴) to the authorities concerned(相關部門).

To solve this problem/ surmount this difficulty/ improve the situation/ crack this hard nut(解決問題), I hope to draw the attention of the authorities concerned.