First Credit Resources Inc

I have been trying to settle an ambulance bill for over a year. I have sought the help of the insurance company, and they have tried to get a resolution. They have asked the ambulance service to resubmit the claim. The ambulance service has sent this to collections, and I have received letters that they will come to my house or press charges on me. I did get payments from my primary insurance I am willing to pay on, but it is not my fault the ambulance service did not bill correctly the first time and then waited over a year to bill medical assistance. I just need help.