I am very unhappy with your service!
我對你們的服務很不滿意。

be unhappy with...
對...不滿意
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.
上個星期我們去度假。風景很美，但是我們很不滿意我們住的酒店。房間很小，地毯也不干凈。

A:Hello,Mr.Johnson.How can I help you?
您好，約翰遜先生。請問有什么可以為您效勞？
B:I have asked three times for fresh towels to be delivered to my room.
我想要幾條干凈的毛巾送到我房間。我都叫了三次了。
A:Nobody has brought them to you?
沒有人給您送過去嗎？
B:I have been waiting for almost an hour!How can I take a shower without a towel?
我已經等了差不多一個小時了。沒有毛巾我怎么洗澡？
A:I am terribly sorry,Mr Johnson.
十分抱歉，約翰遜先生。
B:I am very unhappy with your service.
我對你們的服務很不滿意。
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房間。我現在給您送過去。
B:Thanks.I appreciate that.
謝謝，我很感謝。
A:It's the least I can do.And I can give you a discount for your entire stay with us.
我是我應該做的。而且我還可以為您在我們酒店的整個入住期間打折。
B:That's very kind of you.
你太好了！
A:It's my pleasure.I will be right up with your towels.
不用客氣。我馬上給您送毛巾上去。