Account he gave me is hacked.

I bought a account from him, he gave me full email access yet does not know any of the original information to the account which lead the account being hacked. I did not see anything in the email regarding the account being changed yet i got logged out and my password changed/ email changed from the account i bought. I tried asking him for the original information for the account so i could submit a ticket to kabam, yet he could not provide me the information. I payed $450 for this account and he said theres nothing he can do to help.