Impossible to cancel contract???

Cell C, How do you run a company like this? I phoned your cancellations line on 24 January. I was told my contract would be downgraded to prepaid on 24 February. That date came and went and my cancellation was not actioned. My debit order went off again. I phoned again today and spoke to Marvin in the retentions/cancellations department who said that nothing was logged about my request and I now have to wait another 30 days as my notice period. How do I know I'm not going to have this same problem in April? My fiance is having exactly the same problem trying to cancel a contract she has with you. She's logged the cancellation twice now and the contract is still active and her debit order is still taken every month. Is this your way of *****ing an extra few monthly payments from your clients? Pathetic.