Basically, ACTseller 's selling hacked accounts or he's the original owner trying to make fun out of scamming people with their account. However, I'd entreat you that don't give your account to the person unless & until they do prove that they're the original owner of the account(they should be able to sign a message). Other than signing a message there isn't any strong proof to be believed IMO.
I am still waiting for Op to give some more proofs that he is real owner.However it already seemed like right from the beginning he was careless and he didn't staked a address in his account.Also i don't think that ActSeller will now come again as looking at his address transactions it seems like he already sold his account and closed his account shop as I think the previous scam accusation against him might have worried him about his business.
-$nip-
I have sent you a PM.