<prompt> Human: A collector lawyer contacted me today about a credit card debt. My ex husband got the card in September of 2007. Thats when we started dating. I never knew about the card and Im pretty sure he did not have access to my social security number. In August of 2011 it was charged off and sent to collections. We didnt get married until August 2010 and divorced June 2012. What bothered me is the collector had my new married name, new phone number and my social. I dont know how he got this...I check my credit report at least twice a year and the card has never been on there. Theyre trying to get 3400 from me and saying we fraudulently got the card by lying about our income. And that Im going to get a summons and put in jail if I dont take care of it asap. This isnt my problem right? Should I just wait and see if a summons arrives? I feel like hes trying to scam me out of money I dont owe.  <response>: Send a registered letter asking for proof the debt is yours, including the signed credit card application.You wont get anything back.EDIT: Postal experts below say send it certified. 