Worst service, *********** staff and systems

So for over 2 months now MTN has been overcharging by bank account with a huge chuck of money. I have laid complaints/cases in all possible platforms including a physical store at the branch, their head office, customer care line/135 as well as credit management email adress. To my surprise a month later all I have is just case references with no solution. The sad part is that I am being compromised financially and not a single person is competant enough to assist from MTN teams. Mtn service is embarrassing to put it mildly.