Flawed cancelation process and incorrectly charged.

I cancelled my wifi contract in December and I was mislead and advised to think that the cancelation was effective and when my invoice came out. I was billed an additional month. After numerous calls to their rentetions teams and multiple complaints. They eventually cancelled the contract confirming no cancelation fees and that I would be reimbursed for the additional month that I was billed. I then got Feb invoice and was charged an additional R1500 totalling to over R2000. Now they not reaponding to any of my complaints. Everytime I am advised that a manager will call me back and no callback. I would never recommend MTN to anyone. Their processes are inconsistent, their staff are unprofessional and they do not take any accountability for their mishaps. I have been a customer for over 12 years and never missed any payments. I will no longer do business with them after my final contract is paid.