Unpaid accounts every month repeatedly!!

I have been a member of Discovery health for more than 15 years. Since 2014 I have been receiving monthly treatment at Montana Hospital with the same Doctor and the same ICD10 codes. Since last year October 2020 every month I am battling with Discovery to pay my account. Now, I am sitting with an outstanding account for February 2021 and another account that was just rejected for April 2021. I must go for treatment this coming Friday, 14/05/2021, and I don't even know if the hospital will admit me with an outstanding amount of nearly R200K. I am fed-up sending emails, calling and getting empty promises. What more must I do? My health Is deteriorating due to the fact of more stress of these account!!