Discovery deliberately delaying claims ?

I have been trying since 25th September 2020 to get Discovery to provide definitive answer to how much they will cover for hearing aid. At least two Audiologist confirmed that Discovery System does not have the approve NAPPI codes - that is one of the reasons why DIscovery provides me with NAPPI code for hearing aid for children. I have escalated this matter to DIscovery Complaints Department after the Intermediary appointed by Discovery has been unable to assist. Audiologist is refused assistance from Discovery to get approval. I emailed - no resolution. I was called with promises - all empty. I called ***- only to be put on hold for extended period