MTN POOR SERVICE

One year into a data contract with MTN for a meagre R128.82 per month, I received an invoice from MTN for the month of March for R1443.10 (90% more than my agreed, capped contract. At first I was calm about it thinking it was an easy fix. How wrong I was!!! At 20 calls later and countless emails....they still deducted this incorrect amount from my bank account (after assuring me that it was not going to happen). All I received from MTN was computer generated replies to my cries!! Eventually I had to contact my bank to reverse the debit order. Thanks to MTN one of my life policies was not paid. I still have not been given an explanation as to why this happened