MTN's PATHETIC SERVICE

I have renewed 3 of my contracts in November 2018. I have since had charges duplicated ie 2 debit orders and an overcharge on my debit order monthly. I have been to the Ballito store in KZN, logged tickets but with no resolution. I tried the manager of Ballito and he simply does not answer calls or messages. I guess that is the reason for the pathetic service at that store from his staff. He is non existant!!! If he doesnt care, why would his staff care? Ticket 1- ********** 2316, ********** 30, 1- ********** 16307. Kindly resolve urgently