I just got scammed! I need something!

So, I just sold this guys powers on this thing called xat. It's a chat website.
And he scammed me. What I was buying was an AQW account. I got to where I accessed the account but he banned me from the chat when he said he was changing the email.

Does anyone know how I can hack into his email and change the email to the AQW account?

he cant change the email if he doesnt know the pass of ur email u used for your account, if u know the email then request the password and if u dont sucks for u