Disgusting service with NO ANSWERS

I’ve been admitted into hospital today where Medshield has declined my authorization when I have due to exclusions when I have been with there medical aid group since 2018 and only changed my plan with them last year , I’ve called and no one calls back or can give me real answers and I have been told I need to speak to the underwriting department so they can fix the mess up they created and no one can call or even care to help this is absolutely ridiculous service definitely with be going further with this if I do not receive a call from management or the underwriters ASAP