I have been pleased with your services for years，but now I feel very disappointed.
多年来我一直很满意你们的服务，但现在我非常失望。
I would like to draw your attention to the problem/fault……
我想让您知道这个问题/错误……
I am writing to inform you that I find…… unsatisfactory.
我写信是为了告诉你我发现……令人非常不满意。
I wish to express my dissatisfaction/disappointment about……
我想表达我对……的不满/失望。
It would be highly appreciated if you could……
如果你能……我将万分感谢。
I trust you will take my complaints seriously and……
我相信你会认真对待我的投诉，并且……
I hope you will give due attention to this matter.
希望对此事你能给予足够的重视。
I would like to get this matter settled by the end of this month.
我希望能在月底解决这事。
I could not be more satisfied if you can kindly……
如果你能……我将会非常满意。
I would appreciate it very much if you could……
如果你能……我将非常感谢。
3.必背经典范文
Dear Sir or Madam，
I am writing to inform you that I wish to move into a new room next semester. I would like to have a single room， because I find the present sharing arrangement inconvenient.
I am dissatisfied with my present roommate because of his inconsiderate behavior. For one thing，his friends are constantly visiting him；for another，he regularly makes calls at night. In addition，he often uses my things without asking for my permission. Under such circumstances，I find it difficult to concentrate on my studies，and I am falling behind in my assignments.
I believe you will agree that the only solution is for me to move into a room of my own，where I will be free from these kinds of distractions. I would be very grateful if you could arrange a single room for me，preferably not in the same building.
