Impossible to cancel a vodacom contract

I always hear of other companies making your life difficult to cancel a contract with them. But i have been assistimg my mother simce July 2020 to cancel her contract, which still to this dsy isnt done the sim card in question hasnt even been switched on since way before that too. We have spoken to many agents and they all say they habe canceled and my mom will be reimbursed for that amount from the initial cancelation request. But she is still beimg charged. Today we again attempted by speaking to Joy who said exactly what everyone else has said. But this just beimg said is not enough, we need action and for thimgs to happen with immediate effect. We are tired of hearing that you have escalated the matter cause clearly that means nothing. And neither does client service, seeing as though it is only 1 of a few numbers that we hold with vodacom. Clearly client services are none existent.