I have a lot of imposters, there really isn't anything I can do about them. If I could, I would ban them from MSN, but that isn't possible...
If they have TTG or RuneCore accounts, they usually don't admit what they are, so again, I can't ban them...
All I can tell people is that I have imposters, usually 3 or 4 at a time. My belief is that it is your own fault to get scammed by an imposter. I have said it before and I will say it many, many more times: Always get a confirmation PM.
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Moving to trader feedback.