Just keep sticking with this until they sort it out.

Have you talked to your doctors about the problems with the insurance company? They may have more experience with what to do to deal with the paperwork properly, plus it is in their interest to GET PAID so they may work harder to sort it out than the insurance companies will.

Good luck... And try not to let it cause you undue stress. I know that is hard, but you are the one caught in the middle, not the one causing problems.