Cell C Service is Pathetic.

Service i am receiving is Pathetic. I am a long time customer of Cellc and i changed banking details about 4 Months ago. Since then i have been to the Mall of Africa Branch 2 times and called the Call center once AND received a call today from CellC about my outstanding account. All of these times aside from the call today, i requested to change my banking details but Cell C STILL debits my old Account. On top of this (and this is what drove me to post here), i get a call from 084 140 and i had to WAIT for the lady on the other end to finish what she was doing then answer the damn phone. Is this how Cell C works?. Then ****ed of as i am i try to explain to the lady i have been to Cell c 3 times and i want them to sort this out as i cannot take MORE time out of my day to deal with this incompetence, she just states we will still debit your old account until you pay and your name will be on ITC. I cannot believe this service i received. Please can someone of higher authority contact me to sort this out and this time i want proof and confirmation that my banking details have been changed successfully. I dont need this stress in my life right now, something that could have been resolved if Cell C hired competent people who are actually interested in doing their jobs and not just sitting there and collecting a salary!.