Canceled medical aid 2 months ago, still trying to debit my account...

I canceled my medical aid with discovery in September because I'm unhappy with the medical aid. called about 4 weeks thereafter because I received no further communication that it has been canceled. The lady that took my call said she can see that I requested it to be cancelled but it has not been done, she could not tell me why, said she will send in a request now to cancel it and backdate it to the date I first requested it. Today, two weeks later they try too debit my account with the amount, I transferred all the money out of my account as I knew they will do that even after the lady assures me that it won't happen.. please credit me with the R100 no funds charge or I WILL take this matter further...