Cell C customer care - poor service

Cell C your agents are running your company down. It’s been 5 months of trying to cancel a SIM card contract with you. Each an every agent since then has been confirming to cancel my contract, 5 months later I’m still get a debit order from you. I maybe not be sure that you are giving this mandate to your customer care line employees “not cancel any customer contracts” but I’m taking all my business away from you ( of course when you decide to cancel it) and those around me.