MTN Cradlestone service - PATHETIC!

MTN CRADLESTONE SERVICE IS PATHETIC I did a upgrade in January 2018 on my daughter's phone. Bongani helped me and I were very happy with his service. She took the iPhone X and was surprised that Bongani explained she will only pay just over a R100 more on her contract that she had. In February the debit order went off for more than R600 more than what she was paying. We went back to MTN. Bongani said he made a mistake and that the iPhone X was very expensive, and although he made the mistake, we agreed after about an hour and a half talking with Bongani and the branch manager Iyanda that she would take the contract over 36 months instead of 24 months in order for her to only pay the agreed amount that Bongani said originally. It was suppose to be rectified and we would start paying the right amount in March. Every month the same amount went off. I phoned March, April, May , June and not Bongani or Iyanda returned my calls. I took leave from work last week and went back to MTN. Bongani was off but Iyanda was there and did remember me and the whole iPhone story. He promised to rectify it immediately and still phone me the same day. He took my cell number and work number again. I am still waiting for some one to call me and tell me what is happening. Paying R600 more than what I budget for and what Bongani said it would be and still no reply from MTN.