@DannyB
It seems quite unprofessional to sell an account and not allow the buyer to be able to even change their password, unless you explicitly mentioned this before you were going to receive the payment or had it in your ToS. I've placed a DNT on you for the time being.
@XBUDX
DannyB seems to be willing to change the email to yours in '3 days'. Do you want to wait for this period or do you want your money back if you feel the account is unsafe or you've lost trust in the seller? The decision is up to you.

