False advertising and poor service

I bought a cellphone on the Vodacom network from Hi-Fi Corp Southgate on the 20th July 2019. Part of the package, I am supposed to get 800mb of data monthly for 12 months. To date still no data allocation. I have been to the Vodacom store at Southgate Mall and called into the Call center numerous times and no one is able to assist. I am in possession of a document received from Hi-Fi Corp whereby it clearly states a promotion that Vodacom is running. How is it that no store or the Call center knows about this. I cannot call the call center daily to fight for data that is supposed to be loaded monthly and also the holding time is ridiculous, sometimes I have to hold on for up to 45 mins before the call is answered. I have also been to Hi-Fi Corp numerous times and they are also unable to help. I feel like this is false advertising and very poor service. Vodacom staff are not trained properly and are also not aware of promotions running within their business.