OP is asking me to remove my feedback for a successful trade because of what happened to them.
I don't think you should remove anyone by anyone's speech. But if you think that person is a scammer or can scam then you should remove it without anyone's speech. Even trust can be the opposite positive to negative.
Please proof the messages by forwarding to a trusted user.
Check if my username was @ambosss
I don't think op can proof it because telegram is the easiest way from where all chat information can be removed within a second. And telegram username can be changed also at the same time a new account can be created on the previous username.