Miway Debiting and not cancelling policy

I have been having problems with debit order dates since December 2019, I have called in on numerous times to sort this out , and got to a point where i have asked to have my policy cancelled , i was phoned by a very lovely lady who assured me things would change however i still opted to cancel as i took insurance out else where. I have sent yet other email requesting my policy to be cancelled yet they are still trying to debit me. in January miway took more than 2 x my normal debit order , i was advise to return the debit order which i did this cost me an additional R40 and was assured the normal debit would go through only to have miway try debit me over R1400 i have now had to empty my account as miway are still trying to take month out of my account. This month alone they have tried 3 x to take money out of my account each time being more the the last time. I am sick of the unnecessary bank charges i have had to waste as well as now none of my other debits are going through due to miway keep trying to take money to a point where i leave no money in my account , If Miway cant even follow a simple instruction to cancel a policy how would i ever get money back from them if they get to take the increased debit orders weekly. Miway your staff are very friendly and helpful yet your systems seem to do as they please. I want my policy cancelled as per my original instruction and if you continue to debit my account i will be going to the insurance obudsman and demanding my bank charges back. I am appalled that i have to beg and plead to have my policy cancelled as well as to have you STOP debiting my account. Please just act on my simple instruction.