I was taken to a collection agency after the hospi...

I was taken to a collection agency after the hospital treated me for a work place injury. The annoying part was asking them for clarification for months on the 2 invoices that was sent to me for a 100 cad and 680 cad. I paid 600 cad in good faith and expecting the hospital yo confirm to me the actual payment but instead doing that they took my name to collection. I am pondering litigation