My question involves a credit report problem in the State of: Georgia

After reviewing my credit report, I discovered an account opened by my ex prior to our divorce. I wasn't aware of this account and did not consent to become a responsible party for the account.
My question is - how do I get my name removed from the account? I've called the company (a huge bank) several times and written them requesting any proof that I consented to become responsible and so far all they can provide is a computer print out with my SSN and name. I appreciate any help you can offer!