My Vodacom App doesn't work

I've been struggling with the Vodacom to get the My Vodacom App working for 3-4 weeks now. Every time I phone them there is a new excuse for the App not working. I get my data at a reduced price through the app as per Vodacom's marketing of the app to me. When I now have to buy data I have to pay significantly more for the data which I refuse to do because what is the use of having app and my data contract if I just have to pay the normal rates that people without contracts have to pay. They have provided me with a free 1 gig data bundle as part of an apology. That was a week ago and I still can't buy data on the app. I want Vodacom to offer me the data rates that they promised me and not ****** me to pay higher rates because they can't fix their app.