Making complaint

DIALOGUE:

• Mr Cameron: Excuse me sir! I'm sorry to say it, we ordered an hour ago but nothing so far. 

• Manager: I can't tell you how sorry I am, this will never happen again. 

• Cameron's wife: What a mess, you never tell me about coming here again.

 COMPLAINING:

• Sorry, I have a serious complaint.
• Sorry, I must complaint about....
• I am afraid to say it, but...
• Sorry to bother you, but...
• I just don't know how to say it, but...
• Excuse me, but there is a problem about...
• I am afraid there is a slight problem with...
• I am angry about...

 ACCEPTING:

• Oh! I'm sorry about that. 
• Oh ! dear, I am really sorry. 
• I can't tell you how sorry I am. 
• I beg your pardon, I will fix it. 
• Sorry, that wasn't done on purpose. 
• Sorry, I didn't mean it.

 REFUSING:

• Sorry, but there is nothing we can do about it. 
• Sorry, that's not my fault. 
• Sorry, your complaint is not acceptable.