MTN billing HELL and no service

I renewed two contract phones last month and my deal has always been to pay for the gadgets only. To my surprise I was billed over 10 thousand last month and now almost 7 thousand. I been to the store where I did the renewal with and was told that maybe I was double debited and they forgot to reset limits. Limits I didn't sign up for. The lady tells me daily that she has escalated to their GM and billing team. I want out of these contracts, I can't believe that I've paid over R16 000.00 in 2 months for phones. MTN is a ****, ready to port away from this hell. On top of that I have been buying airtime and data. Does the NCR or Ombudsman help with this breach of contract by the service provider cos MTN has taken me for a ride.