Vodacom
Not offering me the best deal

I bought another mygig2 Saturday. To my knowledge I was getting the best deal. This morning I found a Brochure for Vodacom in which there is a special where you get a device and 2 gigs for cheaper. I thought that Vodacom will give you the best deal available and not just let you sign up any contract. I would have appreciated it if the agent told me about the deals available