Dear Sir / Madam,
I am_____(具体名字题目会给出). I am writing to you for the purpose of making a complaint about your_____ （具体事情题目会给出）
As a matter of fact, you have caused a lot of hurt to me due to your carelessness as well as fault. First, it severely affects my normal work and living. Second place, you have brought a large amount of spiritual discomfort. For example, my normal sleep and rest can’t be assured as usual. Therefore, I strongly and firmly require your company to make a detailed explanation for me. In addition, I demand you should make sincere apology to me in person soon. At last, I wish you can seriously consider my requirements and reply to me in two days.
I believe your company will consider consumers’ interest according your working style. I am looking forward to your answer.