Not giving what they promise or offer

I did my upgrade at MTN Cape Gate last week. Fist I had to wait 3 weeks for my phone as there was no stock and on top of that it was the wrong colour which I took because I cant wait for another month for then to sort out their stock issues.

After I did the upgrade, which was a Huawei P10 Plus contract where I was suppose to get 30GB free data as promoted in the store and on TV, I never received my data. Its been 5 days now, still no data. Called the call centre and they say that this option wasnt app**** to my plan. Went to Cape Gate Store and they say they dont understand it was suppose to be loaded. So either MTN dont know how to deliver what is promised or they have no idea how their systems work as no one can get me my data. They then logged a query that will take another 72 hours to be resolved, that is if it will be resolved. Worste upgrade experience I have ever had and still busy having as I still dont have what was promised.