MTN upgrades contract without permission

We have been trying to follow up for more than 3 months on upgrades done that was not approved. Call reference 1- ********** 0976. We have tried visiting your branches in Wonderboom Junction and Kolonade to no avail! Since logging this request we have followed up almost daily only to be told no one has attended to the call we must phone back. The biggest problem here is I am trying to help my dad who can not hear when he phones the Call Centre, the more we ask the agents to make a note on the system that he gave permission, the more we have to verify every time we call! I am not with him always! Can someone please get back to us on upgrades that was done without his approval, he has no signed contract of any sort for the upgrades done and yet you just deduct the amounts via D/o every month! We have no cancelled the d/o at the bank until such time that MTN will call us back with feedback as well as the arrangement to credit his account. Really pathetic and ********* behavior form MTN!!