iPhone 8 Deal uChoose Flexi 350

On the Vodacom website I selected the deal for the iPhone 8 Plus 64 Gig on the uChoose Flexi 350 contract, this totalled to R919 pm and included a free accessory, I selected the free accessory as the Apple Watch Series 3 42mm (Space Grey) as the free accessory, entered my details and awaited a call from the call-center agent, after they called they seemed very surprised that there was a free accessory option in the first place, they then told me there is no stock of the Apple watch, would I like a silcone cellphone cover instead? Ofcourse I declined and the call center agent just okay bye and hung up. I double checked the website, www.vodacom.co.za and discovered the deal was still showing as available with indeed the free accessory option of the Apple Watch series 3 42mm. I once again requested to purchase this deal and recieved a call from a different agent saying the Apple Watch will cost an additional R300 p/m. I however stated that it says free on the website, I have the screenshot to prove it if need be. Needless to say this call-center agent had no idea as to what was on the website or deal for which she was contacting me about.

Why are the call center agents not trained on the actual content they are trying to sell? Why would the be asked to phone potential customers if they do not even know what the company is selling?