Back in August of 2012, I got a collection notice on an account I have no knowledge of. I sent them a dispute letter. Recently, I recieved a letter back informing me I was a cosigner to my exhusband on a loan when we were married. I have no knowledge of this loan. This is the first I have heard of it. I asked them to provide proof, and they only sent back an affidavit of sale. I don't know what to do! I know I didn't sign for this loan.