Misleading advertising

On 30 August 2015 I went to the Vodacom shop to upgrade my contract. The new deal included 2 Samsung Young phones for R99. They told me that they will phone me as soon as they receive the stock which takes about 2 days. After 5 days (4 September) I went back to enquire again. They said they were still waiting for the stock and they will let me know as soon as it arrives. Yesterday (10 September) I went to another Vodacom shop to try and upgrade there since the other Vodacom store didn't get back to me. They told me that the deal had been discontinued. Today (11 September) I went back to the original store and they told me that the deal was discontinued by Samsung. I feel it is ridiculous because it was a deal that was advertised and there was stock available during that time. I am very disgusted and feel like cancelling all 3 of my Vodacom contracts as soon as they expire.