Citibank Debt Collection Complaint

Citibank Debt collection department,

Other (phone, health club, etc.) Disclosure verification of debt Not given enough info to verify debt Ohio

I have been divorce for many years, took the steps after my divorce to get my life back together as it has been over 7 years, I had my credit pulled a couple months back and a debt from a company named One Main Financial was listed, this is my ex husbands debt. Several request via the phone and in writing have been sent to this company to validate this as I do not recall ever obtaining only my ex and this company has never once responded back providing me a signed initial contract with my signature. I have disputed this account also with the - major credit agencies which they have all stated they verified which how are these companies able to verify when I can not. I am lost for words as I can not move on with my life with this old debt which I do not believe I am responsible for is listed that I owe. Does n't a company have to have proof/validation of a signed initial contract and prove that it is within the statue of limitations? I do not know where to go from here I am asking your agency to help me as your company helps consumers.