No data received after upgrade

I have been to Mtn head offices in Rivonia twice and once at Fourways where I upgraded my contract, and I have still not received my additional data bundle. I have called Mtn three times to sort this out and I was told it would be fixed in 24 hours that was Monday the 3rd. I had to wait at Mtn offices for over an hour to be helped and still nothing. The phone calls were too not much shorter. It's been over a month since I upgraded. My data which I've now had to top up with has been used up extremely quickly and which is incorrect, and I know a lot people including myself have complained about the data that has been used up too quickly so there is clearly a problem here.