Not providing me with airtime & Data after upgrade

I recently upgraded my contract in June and was supposed to received R200 airtime and 500MB of data per month. On the 21 June, I received only R200 airtime and 200MB. I called the MTN call centre and was assured that the error would be rectified but nothing was done. On the 21 July 2015, I was due to receive my airtime and data but up to today, I have received nothing. I have called the call centre almost daily and called the service agent who processed my upgrade but no one is able to assist me. I am really disappointed with the poor service from MTN. I have repeatedly asked to speak to a manager or supervisor who would be able to sort the mess out but cannot get to speak to anyone beside the call centre agent who puts you on hold forever... Can someone at MTN who can sort this mess out please contact me !!<br> Ref NO's : *** - 24July 2015<br> REQ*** - 28 July 2015<br> *** - 1 Aug 2015