Mtn - ********** & *******, contract not binding

Firstly my spouse cancelled her MTN contract. For 3 months they continued debiting her account until we complained. Then in 2015 someone authorized a sim swap without my consent resulting in me closing all bank accounts as presumed it was *****. For 2 years Mtn stole my money from my account in charging me for BIS and still haven't credited my account along with other hardware charges. Then I upgraded my contract end Jan 2016 and still getting charged for other items other than what I signed for. I have had numerous phone calls along with 2 visits to Mtn head office in 14th Avenue whereby Senlot and Siphilelele confirmed all was sorted which is not even close. I have asked for a manager on both visits whereby I get fogged off to one of his minions. It is a loosing battle as no one has a clue how to resolve these issues and in the interim I am paying the debit orders.