I think it's not hacked but tricked, I do not know whether the sale and purchase of accounts on this forum are legitimate, if you want to buy and sell on this forum you should use a trusted escrow, because it can avoid fraud, by the way how much did you give the price for the account.
It's not that selling bitcointakk accounts is prohibited so it's not allowed because they can use many accounts, and I'm sure even if sales using escrow services will get red trust from DT.