Charged for a product that I have not been given

In May I did a contract upgrade with MTN in Fourways. I was told about the May promotion of 40 Gigs data. I then opted for that. On the 12th June when my data was reloaded, I was then only given 5 Gigs. When I called MTN, I could tell that the lady I spoke to actually had no idea what was going on and she gave me some lousy reason. I then went to the store where I did my upgrade, they logged a query and escalated the matter and I received an SMS with a reference of 1-4*************. I called MTN again and a lady by the name of Nomhle said that she had escalated my query. On Tuesday I received an SMS saying that my query was resolved. No data was loaded on my phone and no explanation was given to me. This is obviously a breach of the consumer protection act as I have not been given the product that I have agreed to pay for. This is also a ********** activity by MTN!