I received a 1099-c for a debt that was paid off

I had taken out an online loan in 2014, which I was delinquent on, so they sold it to a collection agency. I did pay the collection agency the amount owed within 2 months. Now I'm receivng a 1099-c for that loan and having to report it as income - but it wasn't. How can I show this on my return that the debt did get paid? It makes a significant difference on my refund.