Diabetic

So i am a diabetic for 26 years now, due to some reason our company switched from liberty to discovery medical aid and i was told 'dont worry discovery is the best' but upon my switch to discovery they refused to pay for both my insulin shortacting novorapid and longacting lantus discovery will pay for 1 insulin and to a threshold after 26 years i never had to fight like this and i have been on medical aid all my life it is really a disgrace and to top it off i had to choose from a list the insulin discovery does cover so discovery dictates your medication and upon numerous motivations from my dr still they do not want to assist