Continual Billing yet contract is cancelled

I contacted DSTV on 25/08/17 requesting that I cancel my subscription as I will not be needing their services for some time. I even had this escalated to the call center supervisor as the agent didn't seem to understand my request and told me cancelling is almost impossible. I then spoke to the supervisor and agreed that the billing run of 25/09 will be the one to cover the cost of the explorer that they needed me to pay. In October DSTV takes it upon themselves to continue to Bill me. I query this and with no success I contact my bank to reverse this, to date I'm still being billed by multi choice for over 3k at at me. I'm frustrated as I can't keep making calls to correct what should have been long resolved. I'm infuriated by this. I don't need this admin in my life!!!!