英文投诉信的作文,怎么写啊!

投诉什么？我必须要知道才能写。

Dear 投诉的人， Thanks for the complain letter on 7 June , 2012 . We have looked into it . I am very sorry to see your complain about the attitude of our workers . We have ordered the relevant staff to correct and apologize . The other workers have also been given a strict warning . We will ensure that such incidents will not occur again . I hope that you can accept our sincere apology . Yours Sincerely , 投诉的人名字