投诉信是英语四六级作文考试中应用型题型练习中的重点题材，对考生英语词汇、语法的组织应用能力有较高的要求，在平时的备考过程中，广大考生要通过对不同内容的投诉信的写作练习来丰富自己的写作实力，在考试遇到此种题材时能够真正将备考时期的经验融入进去，提升自己的成绩。下面小编为大家提供一篇关于四六级作文写作中的例文，希望能够对证自拔备考的同学们有所帮助。

Directions: Write a letter of complaint according to the following situation: You bought an air conditioner in Sun Appliance and had it installed the other day, but you found that the fan made too much noise when the machine operated. You demand the store to send a representative to check it up.

Write your letter in no less than 150 words. Do not sign your own name at the end of the letter; use Li Ming instead. You do not need to write the address.

June 23, 2007

Dear Sir or Madam,

I’m writing to lodge the complaint about the poor quality of an air conditioner that I purchased from Sun Appliance Company.

Frankly speaking, Sun Appliance has always been my favorite. On April 4, 2007, I bought the air conditioner (serial number 12345) from one of your chain store located in Lang Fang. The machine operated well at first, but ten days later, there was a fault that bothered me, that is, the fan made so much noise that I could not sleep well at night. Worse still, the cooling system didn’t work well and the machine began to leak recently. Its poor quality ruined almost all my previous impression toward your products.

I strongly suggest that a repairman or a service engineer should be sent to my home without delay. I wonder if you could pinpoint the exact cause of the malfunction as soon as possible. If you can’t, I am afraid that I will request for full amount of refund or a new air conditioner.

I would appreciate all your assistance in this matter. If you have any questions, please don’t hesitate to contact me. Look forward to your reply.

Yours Sincerely,

Li Ming

上述是小编为大家提供的四六级作文写作中投诉信例文，供大家练习参考和经验总结时使用，实际上，大家在写作过程中要将自己所获得的经验真正融入到自己的备考之中，真正转化为自己的考试实力，获得理想的成绩。