Pathetic Service from Vodacom!

I went to upgrade at the iStore at the V&A waterfront last week Thursday and wanted the iPhone X with the add on of the AirPods. I was told the deal has expired and not available anymore. I was in canal walk yesterday and went to the Vodacom store and not only did I see it in the brochure but I was told by the consultant it is still available but they cannot help me and I need to go back to iStore and they need to reverse and redo the deal. Can you please tell me why a client of over years with a spend of over 2500 a month is treated this way? Because I can assure you that the iStore is very very *********** and I am scared to even go ask. What is my recourse? Can Vodacom assist and make this an easy fix or am I going to be the victim of a large corporation and red tape? I complained on twitter and got told that it is my problem and sorry for me....try fight it with iStore...good luck....is that really the service you expect from a company like Vodacom? now im stuck for another 24 months!!!