MTN is Overcharg Me

Good day<br> I upgraded my MTN contract early Aug and did not have service for appx 2 mnths of which I had to personally go to MTN at Randburg of which it was of no help. From August the line was up around early November. When I upgraded, I called MTN on the 5th and 13th of Aug to advise them to set my USAGE LIMIT to R0.00 which they confirmed. I m surprised now that MTN is charging me extra R1 600.00 on my invoice for excess usage yet I told them to set my lmit to ZERO and they confirmed. Is it my problem that they changed my request yet I had close to two months without network and used my money to go to their offices which did not help. THIS IS NOT Proffessional. I gave an instruction and I m not going to pay this. The number in question is ***. <br> My Contact is ***<br> <br> the Rf Number for today's call is ***