Discovery doesn't care about my health

I have an executive plan with Discovery, hoping that for an important dimension of my life I'll receive better service. There is an email address that you can write to and sometimes, only sometimes, get a response. After two life-altering events my neurologist and pschyciatrist changed my chronic medicine to something different and where the active ingredient is different. Discovery, however, I realised when I tried to get the prescription filled the second time, only covers a small portion of the costs (there was no problem the first time). I tried to get clarity on the issue as my Neurologist were on leave and my Psychiatrist in isolation, but received no assistance from Discovery. Response while calling was slow, I was cut off often untill I wrote to the Executive line, which was a waste. I was promised a call back which never came. I just received an email suggesting I return to the previous meds. I was trying to understand what similar medicine to the newly prescribed medicine is available on the list. I called again, emailed again, but no response. To this day nothing.