Hospital Authorization not given correctly

I am on treatment for a condition which requires me to go to hospital on a monthly basis. This normally means I have to stay for at least 3-4 days and if the Dr pick any irregularities up, I have to stay for longer. When I started my treatment in 2015 Discovery used to authorize 4 days stay for the treatment. Suddenly since middle of 2018, they only authorize 1 day. Now the doctor and the labs get paid from my day to day or savings account and as soon as I see it, I have to phone Discovery, lock a query and wait for them to fix it. I have discussed this to lengths with Discover it is time and money consuming. One months treatment costs me about 4 to 7 calls to get it sorted not even speaking about the emails. My profile was transferred to rare diseases and I though it would get better but it didn't . I tried to speak to someone higher up in hospital authorizations, management, you name it but with no luck. This is now my resort to try and sort this mess out as I have to get this treatment for my whole life.