Vodacom does not honour contract services

I upgraded my contract in May 2018 with a deal from the cover of the May/June pamphlet of Vodacom4U. The advert clearly says I'm entitled to 1Gb data per month for 24 months as part of the deal. To date, 5 months later, I have not received this data. Countless phone calls and escalations to the store (Northgate) itself, and I now get the response that this was a printing error. I DO NOT buy this story. Had it been an error, I should have been informed at the time of the contract. Furthermore, this should have been communicated as soon as I queried it, giving me the option to opt out of the deal. The bottom line is Vodacom does not value its customers as I have not had a single call from a Vodacom representative. It is impossible to talk to anyone other than a call centre agent who are no help at all. All you get is the runaround to talk to the store who supposedly escalates my issue, and feedback is never forthcoming...