Billing nightmare

My dad is 76years old, Sizwe hosted has been double-debiting his monthly premiums. First, we are told there is an arrear amount of R1500 accumulated over a period of month. How do you get arrears on a debit-order??? Second, a debit order got rejected in August 2023 because the medical aid wanted to debit double, so my dad went and made a direct deposit. But thereafter, there's been a series of double debit orders every month, instead of a monthly premium of R2135* the amounts have been ranging from R4044 to R4248 since October 2023 to date. This February 2024 is the fourth month we have been making follow-up to have my dad's nightmare sorted out, to no avail. Not sure what kind of scheme is being run here but this is a clear daylight ******* to a frail man. To top it off, last week when he was due for his prescribed medication, the doctor told him his medical aid has been suspended. When we call the medical aid for assistance, we moved from pillar to post.Told to leave phone numbers for call backs that never get returned. Auto-generated emails that promised to revert within 3-5 business days. Extremely poor service.