No data for 2 months, yet I still pay for it

I upgraded to an iPhone 6 about 2 and a half months ago - to the MTN Top Up 100 package - which would give me monthly airtime (R100), sms' (25) and data (500 MB). This is the second consecutive month that I've been fully charged and haven't received any data. I went to Gardens Centre MTN to ask them why I haven't been given any data and she said that there was a delay on MTN's side and that it would go through within the next 24-48. It's been 3 days later and I have yet to receive anything. Called the call centre and was put on hold for hours with no response. Terrible customer service MTN.