考研英语写作中，投诉信是一种常见的应用文写作类型。在撰写投诉信时，使用一些高分句型可以使你的作文更加规范、流畅，并给阅卷老师留下良好的印象。以下是一些考研写作中可能会用到的投诉信高分句型：
开场白：
I am writing to express my dissatisfaction regarding...
I am writing to complain about the poor service I received at your store last week.
描述问题：
I have recently encountered a problem with the product I purchased from you.
Unfortunately, the item I bought from your online store is defective.
具体说明：
To be more specific, the problem lies in the fact that...
The issue is further complicated by the fact that...
表达不满：
I am quite disappointed with the quality of the product.
It is really frustrating to have to deal with this issue.
说明影响：
This has caused me a great deal of inconvenience.
The situation has significantly impacted my daily life.
提出要求：
I would like to request a full refund or a replacement of the item.
I am hoping for a prompt resolution to this matter.
期望回复：
I am looking forward to your prompt and satisfactory response.
I would appreciate it if you could look into this matter as soon as possible.
结束语：
Thank you for your attention to this matter.
I am awaiting your reply with the hope that this can be resolved amicably.
附加礼貌用语：
I trust you will take my complaint seriously.
I am confident that your company will handle this matter with the utmost professionalism.
结束敬语：
Yours sincerely,
Sincerely,
① 开头常用句式
I am writing to complain about/that...
I am writing to inform you that I am dissatisfied with you...
I think it's high time you realized...
I am writing to make a complaint about...
I feel sorry to trouble you but I am afraid that I have to make a complaint about...
I am writing to express my disappointment/ dissatisfaction/ concern about...
I am most reluctant to complain, but...
I am writing to advise you that I find...inconvenient.
I wish to draw your attention to the problem / fault...that I bought...
I venture to write for complaining about...
I feel sorry to trouble you but I am afraid I have to make a serious complaint.
It is with great reluctance that I must inform you that...
I regret to inform that...
Thank you for your...which arrived yesterday. Unfortunately, ...
② 结尾常用句式
I would be grateful if you could...
I trust you will take my complaint seriously and...
I will appreciate it very much if you could...
I must have you fully understand that without a satisfying solution, I will reserve my right to take legal action.
Frankly speaking, I am not prepared to put up with the situation any more.
On the condition that this one proves to be unacceptable, I will receive a refund.
I would appreciate it if you could...
I understand you will give immediate attention to this matter.
I look forward to your dealing with these problems without delay.
I would like to have this matter settled by the end of...
I shall be obliged if you will look into...
I understand you will give immediate reply to this matter.
If I must be constantly annoyed in this matter, I shall have to...
③ 其他常用句式
The reason for my dissatisfaction is...
Under these circumstances, I find it difficult to...
I can no longer tolerate / bear...
For one thing...For another...
I hope we can manage to sort this out amicably.
Therefore, I hope to change for another...or I declare a refund.
We know that you are not generally careless, but we would like your assurance that this will not happen again.
I recently ordered / purchased from you...
I must protest against...
I find it appalling and distressing that...
I received such poor service that I felt I should bring to your attention.
If I receive this type of treatment again, I will take my business elsewhere.