Rejected maternity benefit claim

I went to a gynecologist that's on my network list for my monthly visit for pregnancy. Before doing that 3 months ago I activated my pregnancy benefits and confirmed all the things I am covered for. So just to be sure I still phoned the gynecologist to make sure they are on my network and they said yes, the reason being most of the gynecologist on the list on the app aren't even part of the scheme anymore as I was calling them with a discovery advisor and he also was just as shocked how many weren't updated. My gynecologist phones me to say that my medical aid didn't pay as I didn't get authorization to see him. Actually very annoying that even with medical aid you still must deal with incompetence. I've never had to get authorization for pregnancy with discovery this is the first for me.