Discover Credit Card Complaint

Discover Credit card department,

Virginia

My ex husband applied for a Discover card and listed me as an authorized user without my knowledge. After we split up, he stopped paying the bill which is none of my business, except that it is showing as delinquent on MY credit report. That should be illegal. I could open an account with them and list someone I did n't like as an AU and totally - their credit without their knowledge. I think this should be illegal. I could understand if I was a co-app but I had nothing to do with that card. Discover ca n't even discuss it with me because my name is not on the account so I have no recourse. This is the only negative remark on my report and it is impacting my refinance rate/options. Please help.