No feedback since last month

I've been an MTN contract holder for going on 6 years now and app**** for an additional contract online last month which is considerably lower than the current contract I have, I was told I would get a call from the call centre after entering all my details but haven't been contacted yet. I went to a store and to constantly be told that they don't have stock of the phone. I tried again last week with a different phone and was told I would be contacted and I'm experiencing the same issue, again I go to 3 different stores and lo and behold there is no stock. what's the point of advertising these deals and having all these adverts when you wouldn't give a customer the light of day when they want to take you up on one of your deals, I'm due for an upgrade on my existing contract but I am seriously thinking against it with this kind of service.