I am very unhappy with your service!
我对你们的服务很不满意。

be unhappy with...
对...不满意
We went on holiday last week.The view was really beautiful.But we were so unhappy with the hotel.The room was very small,and the carpet was not clean.
上个星期我们去度假。风景很美，但是我们很不满意我们住的酒店。房间很小，地毯也不干净。

A:Hello,Mr.Johnson.How can I help you?
您好，约翰逊先生。请问有什么可以为您效劳？
B:I have asked three times for fresh towels to be delivered to my room.
我想要几条干净的毛巾送到我房间。我都叫了三次了。
A:Nobody has brought them to you?
没有人给您送过去吗？
B:I have been waiting for almost an hour!How can I take a shower without a towel?
我已经等了差不多一个小时了。没有毛巾我怎么洗澡？
A:I am terribly sorry,Mr Johnson.
十分抱歉，约翰逊先生。
B:I am very unhappy with your service.
我对你们的服务很不满意。
A:I understand.Let's see..you are in Room 401.I will personally bring you the towels now.
我理解，我看看...您住401房间。我现在给您送过去。
B:Thanks.I appreciate that.
谢谢，我很感谢。
A:It's the least I can do.And I can give you a discount for your entire stay with us.
我是我应该做的。而且我还可以为您在我们酒店的整个入住期间打折。
B:That's very kind of you.
你太好了！
A:It's my pleasure.I will be right up with your towels.
不用客气。我马上给您送毛巾上去。