False advertising

Vodacom advertising falsely. Advertising products that are obsolete, as their agents call it. This is really not acceptable. iPhone 6s plus deals null and void. Shocking, then the agent advises that I should go and check in store. Check every store in Johannesburg and nobody has stock except Chatz in Cradlestone who advised that they have it but not for R299 per month as advertised. Spoke to Elaine the manager and she advised she will check the price and revert. Upon my 3rd contact with her, I was advised that they have a 6 and not an s or plus. This is also not at R299 but at R329, how is it possible when I was at the store I was advised that they have the phone which I told them to hold for me and query the price and now they don't have that specific phone? Vodacom advertised this on the internet and is still advertising it yet they cannot honour the deal. I want the phone as it states limited stock available and I am calling all the time with no end result