Being an authorized user does not give them the right to create a new account without your authorization and obligate you to pay... your attorney is a jackass.. Contact legal aid or just make them sue you and when you get to court all you have to claim is
1.) I did not create or authorize this account , the debt is not mine
2.) Show me the contract with my wet ink signature
Then sue the cr*p out of them for their illegal actions, identity theft.
;-)