Discovery gives the worst service to its customers

I went in for a operation on 11 March 2024. After struggling to get authorization for my procedure - I now received bills from all over saying that Discovery does not cover all these costs. I don't know what the authorization letter was for then. Also why don't my Discovery GapCover then cover this. The service received from Discovery is absolutely horrible and as soon as all of this is sorted I will look elsewhere for a better medical aid. It's true what they say, that at Discovery you are just a number. The service is terrible.