Incompetence!!

Tired of incompetence from MTN!! My banking details changed in July, the debit order which was supposed to go through bounced and when I noticed that I immediately called MTN and they gave me an option to pay via EFT which I did on the 20th and also asked the lady who assisted me to change those details to the new ones. Later I discovered that my Proof of payment was not attached to my bill and the next consultant who assisted me corrected that. Next thing today I got close to R2400 go off from my account which is not correct, I do not use that much data in a month. My MTN shows that for August R1093.12 was suppose to be debited but instead R2400 went off, for what reason I do not know. 2 months trying to fix one thing with endless reference numbers. I am TIRED of this network!!!