- I have a complaint to make. ..............
- I'm sorry to say this but.................
- I want to complain about...................
- I'm afraid I've got a complaint about...............
- I'm angry about................
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- I do apologize for......
- I must apologize for .....
- I am so sorry for ....
- I shouldn't have...........
- It's all my fault.
- I'm ashamed of.....
- Please, forgive me for......
- I'm terribly sorry for....
- Pardon me for this........
- Please, forgive me for my......
- Please, accept my apologies for......
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