Cach llc

I have received a letter from the IRS stating that information on my tax return does not match information submitted to them. Last year I used a debt conoslidation company to get me through some very tough times. I paid back all of the money specified by this company. I have never heard of CACH LLC the company listed in the IRS letter, nor did I receive any 1099-C form from them. Any idea what this is all about? :evil: