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I'm sorry to say but as people have commented on this thread, it is now un removable.

Best possible way is to give this user what he paid for, regardless of his reaction, after all it's what he ordered, paid for and did not get.
Hopefully he will then close this thread with a resolution comment.
It will only end with disputes both visible on your profiles otherwise

People will jump the gun especially when something doesn't arrive as to per specification. Some more than others but We are all human after all.