DATA USAGE NOT CAPPED AS PER CONTRACT

I received my August statement and to my dismay I find a bill of R1300-00 on cellphone number ***. I walked into an MTN branch to add an additional line in June2015. I specifically advised the consultant that I need that line capped at R478-00 per month Iphone 6.I received a knowledgeable bill in June and July. I do not know why the line was opened but I did not authorise this. I am ****ed at the fact that my name has to be tarnished as a slow payer because of MTN. <br> <br> I need a detailed data usage report on this line. I refuse to pay this amount and I will take this matter to the highest authority. A client is liable for usage that I am not disputing but I was advised that this is a top up line and it should be capped at R478-00 and I will top up if I need to. <br> <br> I am loosing faith in this network. I called the branch and the consultant advised that he will log a query for investigation as the line was supposed to be capped. He said he is not sure as too what happened.