Disgusting service from MTN!!!!!!!!!!!

I started a new job in July. I asked for my debit order date to be changed to the end of the month(last day of the month) and it was not done and my debit order bounced. i also contacted the 808 number to change the debit order date to which i also have not received any ref nr. then again my debit order bounced the next month as well and the bank already charged me a total of R180 dishonoured fees. and for the 3rd time another debit order bounce. i requested a refund on the fees i was charged by the bank due to my request not being attended to and after i was promised by the one lady that she'll call me back, guess what that also didn't happen. i have not been contacted at the time i requested them to contact me and i have also not received any feedback or notification messages stating that the debit order date was changed. This has been the WORST service i have ever experienced with MTN!!!!!!!