Disgusted at Mtn

On the 10th of June I called mtn to have my contract canceled. The lady on the phone then convinced me to switch to my mtn zero which would be free of charge, no costs involved. I asked her numerous times if there would be a cost and she said no. Today R100 attempted to deduct which to my surprise should not have gone off as per the consultant. Now for a customer to be **** to and convinced to switch to something else free of charge and then be charged?? Pure disgrace. And I thought mtn was 1 of the better networks to deal with. I want my contract canceled! I don't want to be charged any fee! And of you insist on a fee then I want the audio for that call.