Upgrade package not initiated

I upgraded my contract on the 26th February to MyChoice 200, this included 500mb data. On the 14th March I received an sms confirming that I have been credited with 200 minutes, it said nothing about my data and sms'. I then dialled *141#, it showed that I had 200 minutes and R 5400 in airtime and no data. I call 808 on the 17th March and was informed that MTN had a system error and that the R 5400.00 was put on my account incorrectly, but that the query had been escalated and they would correct it and then let me know once this was done. On Friday the 27th I called again as I had received an sms to say that I have no airtime or data!! The consultant informed me that the R 5400.00 had been cancelled but no data had been added, he was going to escalated the query and I would be notified via sms. This morning I called again and a very rude consultant answered my call. She informed me that the R 5400.00 was never on the account and that the 500mb had been loaded on the 14th and I had used it all by the 27th, which is a lie. Two consultants confirmed that it was. She got upset when I tried to tell her my side and pretty much didn't want to help me. This is unacceptable. I want answers.