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The forum discourages account sales, therefore no one (at least, no one in authority) has much - if any - sympathy for you in this situation. It is your fault for not doing proper research on the account that you bought before completing the transaction for it, and now you're paying the price for it. Congratulations for wasting your money.
I don't think I should get punished for something which is not my fault or not I've involved in.
You are the current owner of the account, therefore you're automatically involved in it.
You just signed a message from an address that was posted on May 19.....
I believe the account had private keys to the staked address transferred along with it:
Edit: I thought the seller giving me the btc addresses with private keys so I don't need to stake new address and sign new message