MTN - SYSTEMS NOT WORKING AND NOW IT IS MY FAULT ????????????

I recently noticed that my mtn contract is not debiting my account as normal. I been concerned with this and finaly when i got time, i phoned to find out what is going on. Apparently - this is new to me - that if your debit order is not paid after two months. They assume you should know and pay via eft there after, i asked why i was not notified of the change in payment that i was suppose to make instead of waiting for them to let me know. The excuse is that the system had a fault and did not notify customers of the change and ever since then my account has build up to nearly R 12 000 and still each month they carry on as per normal, not cutting my phone off and letting my account reach sky high with-out any communication about that this is happening or that i should do eft payments - how is this a contact and how can this happen. Each month i keep money aside for my debit order to go off and each month nothing happens but life. I AM SO ****ED OFF WITH MTN AND ALLOWING THIS SYSTEM ERROR TO RUIN MY LIFE - AND ALL OF THIS DUE TO A SYSTEM ERROR THE CONSULTANT SAY BUT NOT TO WORRY I CAN STILL PAY IT ALL OFF - *** - waiting for they lawyer to phone me cause i am sure without any notification of this system error, they have to fix it. My phone was suppose to be suspended and they not in control of they own system to prevent debth. WHAT A JOKE MTN