untruthfull service provider

we took out a contract in December that was a red advantage with soni experia z3 and a playstaion for R999 per month. We are getting billed more that we would be billed. Auther at the head office told me that the store should fix the problem and I should be credited, after 2 weeks of trying to get hold of this store manager I finally got hold of him today. He now is telling me that the availability of stock was finished that's why I am paying extra?? How can you tell me that if when I collected the phone why didn't you then told me that? The deal was signed before the stock ran out so how are you stating that T&S apply???take your cell phone and shove it up places and the PlayStation! I will bad mouth you everyday until this query is sorted and I will SUE you!!!!!!<br> <br> You are pleading breach of contract, and if this issue that's been going on from January 2015 is not going to be sorted I will take this further! Do I also need to put op a big sign to get the decent service I deserved.. The worst part of everything is I left Cell C less did I know that Vodacom is worst