MTN TERRIBLE SERVICE PROVIDER

On Friday, 18 October 2019, I paid my outstanding amount of R1160.00, phoned the accounts department and asked if I could send them a Proof of Payment, but was told not to worry as they have already been notified of the payment. I have been having a few bad months financially, but have not caught up. I asked, seeing that my account was now up to date, if I could upgrade my contract. Answer, yes you may. Friday afternoon I go to the local MTN branch at the Secunda Mall, but was told to come back on Saturday as the payment would then show. Did not go back on Saturday but on Sundey. Walked into the store, 3 staff member leaning on the counter watching YOUTUBE, 2 other staff members staring into the distance. I was then told that they could not help me as their photo copier was not working. Not acceptable, I insisted on being helped and was once again told that my account has not been paid. I walked out of the shop and phoned MTN customer care and was told that my account was R1800.00 in arrears.......overnight the outstanding balance went up by +- R600.00, how is that at all possible????? I want an answer and I want it today, and I want to be informed that I can upgrade my contract TODAY. I will not be going back to the Secunda Mall shop because i cannot decide who gives the worst service, MTN or their branches!!!! Does complaining to HELLO PETER make any difference to the way customers are handled??????