Feedback promised, none recieved

So I am still battling with MTN regards my original complaint submitted 5 May 2015! There was apparently a credit passed for usage that has not been allocated to my account. Additionally charges to my account during the invoice period in question for data bundles were not accurate and have not been validated. When calling the call centre they advised that only 3 bundles reflect on the system purchased via ussd, 2 3GB and 1 2GB, the amount I was charged for data bundles was originally +- 1600, these bundle purchases do not add up to this amount. When I questioned the MTN agent he advised the system he uses did not show accurate information. He told me he would take this to his supervisor and call me back. After no call back I called again that afternoon and the system was too slow dor the agent to help me. I called back the following day and was advised the supervisor said he would not assist it must go to validation and billing. I requested to be assisted by billing and was referred to Nomsa. I was promised a call back before 12 PM but did not receive said call. I called back in the afternoon and every day since. Agents have emailed her, no feedback yet! Now call centre closed!