First, pull your credit reports @
www.annualcreditreport.com and see if there are any other fraudulent accounts reporting. If you are dealing with IDT even if it was your ex, you can file the appropriate paperwork and send it to the CRA's and the CA.
Do not send your SS to any CA though
If this is legitimate Identity Theft, then go to
www.ftc.gov and download the IDT Affadavit, fill it out and have it notorized. Check your local PD's website and see if they have an IDT link to tell you where and how to file the report. Once you have the notorized Affadavit and police reports, send them along with proof of ID (DL and SS card w/ first 5 numbers blacked out) and a list of all fraudulent accounts and inquiries to all 3 CRA's CMRRR. By law, if you follow the steps from the FTC, the CRA's must permanently block (not suppress) any account or inquiry associated with IDT. Send the IDT affadavit and police reports to the CA's and OC's reporting on your reports and be done with them. Hang on to all that for the future because you may need to deal with the next CA's(JDB's) to get the accounts.