Debt collection — National Business Factors (TX)

Attempted to collect wrong amount. National business factors took over my medical bill originally from XXXX XXXX XXXX XXXX. I was not being charged interest by XXXX XXXX XXXX XXXX, but now that national business factors has the medical account, and they are charging interest with out my knowledge until a statement 9 months after they took possession of my account. It is to this day the only statement I have ever received and it shows no payments or credits that have been made on this account. So it was false anyway!