Making a complaint: I'm sorry to say this but…
I hate to tell you but…
I'm angry about…
I have a complaint to make…
There seems to be a problem with…
I'm afraid there is a slight problem with…
Sorry to bother you but…
I'm not satisfied with…
Wouldn't be a good idea to…
There appears to be something wrong with…
I was expecting… but…
Sorry to bother you but…
I want to complain about…
I'm afraid I've got a complaint about…
I have to make a complaint about…
I don't understand why…
Excuse me but there is a problem…
Would you mind…?
Accepting a complaint:
I'm so sorry, but this will never happen again.
I'm sorry, we promise never to make the same mistake again.
I can't tell you how sorry I am.
I wish I never happened.
Rejecting a complaint:
Sorry, there is nothing we can do about it.
Sorry but it's not our fault.
I'm afraid there isn't much we can do about it.
