Discovery needs to get their work in order!!!!!

I am very unhappy have discovery, My husband and I have canceled our membership (we were on different plans) through ManageAll four months ago and all the paperwork is in order from their side. But Discovery has kept debiting our medical aid every month from the cancelation. We have to drive to town every month to do a reversal from our bank the closest town is 100km away so besides the hassle of standing in the bank queue every month for the past four month we have to spen a R1000 extra on fuel every month just to get our money back. I am very dissatisfied with this service and I expect them to reimburse us for the fuel that we have purchase every month just to get our money back because off their lack of being able to get their paper work in order and cancel our debit orders!!!