False advertising

About 3 weeks ago I upgraded my Vodacom contract online. I had found a very good deal for the Samsung S6 edge that was affordable and included additional data. At the time that I upgraded, the website said that there was 'stock available' of this phone. I received a phone call the following day to confirm my upgrade and was told that there was currently wasn't stock but that I would probably receive the phone in a few days. I eventually phoned again 2 weeks later only to be told that the S6 edge is at end of line and that no one will be getting more stock of it and that I should cancel the backorder and find a new deal. I feel that Vodacom should not be offering deals on their website when they do not even stock it anymore. I am not willing to give up the deal that I had upgraded to since that is what was promised to me when I upgraded. If they do not have stock of this phone anymore then they will need to find a similar phone in order to meet their side of the agreement.