Wrong debit order

I had a medical aid with Fedhealth which was supposed to resume from 01 January 2021 and my premium was R1393 i then called them towards the end of January to request them to add ewallet savings and they told me that there’s additional R250 for it ok fine.Then I canceled my medical aid with them in February around 15th i was told that it will canceled with immediate effect, effective from the 28th of February then they debited my account that R1393 and the additional R250 that was the total amount of R1643 now my problem is that they debited 250 end of March i reversed it again end of April they debited R500 what for because the medical aid is canceled and i paid them end of February they must stop playing dirty games in account because if there was any amount due to them they were supposed to inform me when I canceled their services and on top of that they keep on sending me statements that i owe them R190 what is it for? And if i owe them R190 why are they debiting R500 in my account, if they do go to my account again I will lodge a complaint with ombudsman. Even my brother is regretting to leave discovery and join them because they keep on chawing his ewallet savings this business scheme is ***