Expressions to complain politely (Let's Talk)
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Five useful ways to complain in English politely.
1. I am sorry to bother you.
2. Can you help me with this?
3. I'm afraid there may be a misunderstanding.
4. I understand it's not your fault.
5. Excuse me, I understand that.


Stay cool when you are making a complaint.  Speak clearly but politely.  Organise your points and speak coherently even if you are very angry over a situation