PJP Health Agency will not pay for my medical bills. This is a scam. Melville, New York

I have been recieving medical bills from various labs and hospitals for
medical work done. I have contacted PJP Health Agency over and over and
over again and even spoken with various supervisors who always inform me
THIS TIME the problem is resolved. I have now recieved several thousand
in medical bill that now state we have tried several times to bill your
insurance company and they have not responded so this is now your
responsibility. I have now been notified that they will be sending the
matter over to a collection agency . At this point I dont know what else
to do or where else to go. I cant get anyone to just pay the bills they
were responsible for. The stress of this alone is enough but now I am
beong threatened with collection agencies and I have already recieved
one letter from a collection company. Why can't anyone resolve this
problem?