10 months of no resolution! Tired now

I had a procedure done on 15 January, 2021 and my Dr submitted a claim to Discovery Health which wasn’t paid in full due to an error on my Dr’s part apparently. The Dr now wants me to pay that difference. I called Discovery Health to explain the situation and I have written to them severally to no avail. No one has taken up this case to resolve it or to tell me what to do. I still get calls and emails from the Dr asking for the payment. He’s even sent debt collectors to collect the outstanding amount which has incurred interest at this point. Discovery Health agent explained that the error was in the submission of the claim , apparently some of the codes mr Dr is using are already covered in the main procedure code. I’m sadly not the first patient the Dr is doing this to because a few people have complained on hellopeter but it seems nothing is being done to fix this matter. I have sent numerous emails, called and spoken to consultants at Discovery Health who promise to help/revert back to me but not much has been done because I’m still being asked to pay the balance. This has been going on since January, 2021. I would like to know if I’m liable for the difference or what’s the way forward. I am tire of the back and fourth. Can someone take this issue up seriously please.

Thank you,

Victoria