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No one will steal your money here if you have a good approach. Your post is not good because it is aimed at destroying his character and many people will find it hard to believe. Calm down and talk to him in a better way...edit this post, remove his name and add a better content on it or run the risk of huge downvotes from the community

@charles1
I've refunded him now - since the last thing I am is a scammer! But he is blacklisted nevertheless.

You shouldn't have.
You made a stance that the majority of this platform, including the users of your service, would have agreed with.

Good that you refunded him for peace sake and good move with the blacklist. Hopefully , there will be peace and less drama so we concentrate on more important issue. Das ist sehr gut mein Freund.