That's the risk of buying bitcointalk.org, all you can do are comment about this problem on seller thread so other people won't be fooled or contact the seller to resolve the problem.
Removing the red trust is impossible without proof and there's nothing you can do without proof.
What? Did you ever read what's the problem or you just blatantly post without read the problem? What in the hell with the seller and resolve the problem?
OP, why the hell you bought that account?
I never see any DT member would like to leave/tag neutral trust on account which was hacked. They would (usually) left/tag the account with negative trust if any account was hacked.