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I am sorry mate, logging into an account actually does not mean that you are the real owner. The hacker can do the same (assuming you are not). If you can not sign a previously used BTC address that was quoted by someone else on the forum then your chances are very thin to get the account back like hilariousetc AKA hilari mentioned earlier.This might help...
How to sign a Bitcoin address to prove ownership (archive): Thanks to shorena for the awesome tutorial.lol my account is back, and now still banned ... it's a matter of not returning my account but unban my account.