Vodacom: We will force our old phones on you!

I am very disgusted with the service I received at the Potchefstroom branch of Vodacom. When they renewed my contract, I stated that I have an iphone4 and would like to upgrade to an iphone5. (For people on the planet earth this means next up iphone5). So I trusted the sales representative, signed the documents got the phone and went home. I only realized when I got home that she gave me an iphone4. Iphone5 might be a foreign concept to her, shame. I called them back and explained the situation but this lady was adamant that I said Iphone4. That makes sense right - upgrade from an Iphone4 to an Iphone4? Uhm no. She wrote down Iphone5 and conveniently misplaced her notes when confronted. The manager was useless stating that I was wrong - because you know at Vodacom the customer is always wrong - and that I would have to buy the phone, then get a new contract. How does the service I received make sense? Vodacom treated me like trash and because of their incompetence I have to sit with the same phone for another two years? Maybe Vodacom should be more transparent with customers - the other networks are? Why force old old models on customers? What show are you running?