Staff Incompetence

I took out a new contract. The agent who assisted (Esther) did not cap the data on the contract even though I specifically asked for this. Month 1, over R3K was debited from my account. I went into the store to query the problem and mammoth amount debited and Esther advised that 'the system' did not cap my data usage but she would rectify the problem and will start the contract over as a new contact. This was in April 2015. Today, over R11K was again debited from my account even though I went back to the store on Saturday, 1 August and again she assured me that she was following up the problem. I have had it with empty promises and because of Esther's incompetence I am having problems month in and month out. It was not my fault that 'the system' did not cap the data. Can someone competent at MTN kindly assist. <br> FRUSTRATED