early debit order

on the 5th of February 2015 I called the call centre to change my debit date from the 1st to the 7th , for the following month and even received an sms as confirmation. Regardless to say that MTN still debited my account on the 1st the next month, and I incurred bank charges for 2 of my other debit orders that went through and left my acc in overdraft , I called the call centre on the 2nd and I was informed that it takes 42 days for a them to officially update the information and that the consultant that helped me to charge my details must have explained which they did not. I was told that a request to listen to the original call would be made and I would be called to be given feed back . no one called me I had to call them again on the 5th to make a followup and I was told that the request to listen to the original call had not been made and now I was told it was made and given another ref number. I called again on the 12th and was not that they had not yet listened to the call and that they would do so .Until today MTN hasn't given me feedback in that regards . I want MTN to pay for the bank charges I incurred as a result of this early debit order