考研英语写作投诉信又可称为抱怨信，其主要目的是表达写信人对于某一情况的不满。人们在生活中经常会遇到一些不愉快的事情，比如消费利益受损、正常生活和工作受到干扰等等，有时写封投诉信不失为一个解决办法。那么，投诉信应该怎么写呢？
投诉信通常包括以下几个方面的内容：说明投诉的原因并表示遗憾；实事求是地阐述问题发生的经过，切忌夸大其词；指出问题引起的后果；提出批评及处理意见，或敦促对方采取措施，或提出所希望的赔偿以及补救方式。
投诉信的写作策略：说明投诉问题——描述具体情况——期待解决方案。
注意事项：写投诉信时语气要冷静、郑重、克制，不必过于礼貌。但也要就事论事，不能进行人身攻击。同时，在描述问题时尽量采用被动句式，使描述更加客观合理。
投诉信的常见句型又有哪些呢？
投诉信开头常用句式和套话：
I am writing to complain about/that…
I am writing to make a complaint about…
I am writing to express my concern/dissatisfaction/disappointment about…
I feel bad/sorry to trouble you but I am afraid I have to make a complaint about…
I am most reluctant to complain, but…
I am writhing to advise you that I find…unsatisfactory.
I wish to draw your attention to the problem/fault…that I bought…
It is with great reluctance that I must inform you that…
投诉信结尾常用句式和套话：
I trust you will take my complains seriously and…
I will appreciate it very much if you could…
I would be perfectly satisfied if you can kindly…
I understand you will give immediate attention to this matter.
I would like to have this matter settled by the end of…
Frankly speaking, I am not prepared to put up with the situation any more.
I must have you fully understand that without a satisfying solution, I will reserve my right to take legal action.
I would be grateful if you could…
I would appreciate it if you could…
