Each account should only be used by one person. Never share your account with anyone else, doing so will likely get the account banned. Players may not sell, share, transfer or lend their account to anyone else. Players should not accept an account that anybody else offers, as they may be stolen, and this could lead to your own account being disabled!"
As mentioned above, there is no support for your situation, as both parties broke the rules.
You should only play on accounts that you have created yourself.