Unfair Billing Practice - TCF Violation

I took a 3G Data contract with MTN in 2013 & was under the impression that when the contract ended I'd be informed it was over & be cut off or continue on the same basis. Lost track of time. Contract came to an end & there was no communication from MTN. They blame the strike. Suddenly my bill went from R79 to an unbelievable R996. I was never advised that there would be out of bundle charges at the end of the contract. Had I known I would have upgraded or made some other INFORMED DECISION! At the moment I am with Telkom Mobile & their customer communication is impeccable. MTN has not treated me in a fair manner. I am always careful to use only what has been allocated so as to remain within budget. Why would I EVER spend R1000 on surfing the net?!! I have called & spoken to Faizel Vice who told me that he cannot help me. Asked me if I did not use the data. Of course I used the data. I was under the impression that it was contract data for R79!! Saa**** in Joburg could not help me.Surely MTN can find someone able to assist. If I had been informed of the change in data charges I would have made a new decision. I need to speak to someone who can assist in rectifying the error, FAIRLY!