How is it possible ,

I have two contracts that were due for upgrade September 2014 and since then cell c has had no stock of the iPhone 6 64 gig! Some one called me around 3 weeks ago but they said they only had gold and that I would be charged over R1000 a month for each contract!!! What a *******! In the cell c brochure there is a contract for an iPhone 6 64 gig for R679 per month! How can there be no stock in the whole of SA????? MTN, Vodacom and Telkom all have stock? Sort this out urgently please else Cell C leaves me with no choice but to port my number to another network