Authorization complaint

I phoned Discovery in January to get authorization for 21 days in hospital. They authorized it. Auth no ***4. After being discharged a few days I went to see a psychiatrist. That they the psychiatrist claimed for my consultation. However the hospital claim reached Discovery after the doctors consultation. Now they are no longer willing to pay the full 21 days in hospital or the full amount for the doctor I saw in hospital. So because 1 claim came before another their systems honores the first claim that reaches them, not the date of the claims. Now I'm sitting with a huge medical bill I didn't bargain for. At Discovery I spoke to Simpewe enquiry no ***, then Porche enquiry no ***, then Hansen, then Tsaraletso who promised to phone me back but never did, then lastly Pershina. Surely I cannot be held accountable for a hospital bill that I had authorization for.