1、第一部分：说明投诉问题

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 …

2、第二部分：描述具体情况

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 .

3、第三部分：期待解决方案

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 （纠正、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 （投诉） to the authorities concerned （相关部门） .

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