Charged for non activated services

Hi, i received a call from a Telkom representative sales person, he was promoting the 80GB of data and i fell for it but later realize that it wasn't what i wanted and that was before they send the sim card to me. I therefor call the Telkom customer care and get no help since they say i must cancel that month-moth contract when i received and activated the sim card. Within few days before even activating the sim card i saw debit order from Telkom claiming R1200 of the activation and data but i never used they sim nor activate, i then logon to the side and dispute it and reverse the debit order but that doesn't help since even today no one is attending to my query and they still changing ref numbers to collect the money from my account can some one help me to get this ********** off my back.