Upgrade available, but no stock while advertised

<p>My contract is due for a upgrade end of April 2017 at Cell C. I visited Cell C Kolonnade, to have a look at the advertised option they have, Samsung J5 Prime on Pinnacle 250 and receive 500 minutes & 2.25GB Data @ R399pm x 24. Today was my second visit to this Cell C shop, to finalise this upgrade. It was recommended on my visit earlier this month, to wait untill the end of April or else I will have to pay both contract in this month. On which the kind lady took my ID copy and rapped it around the phone for this upgrade and this will be kept for me, BUT, this offer is only available till month end. Today is the 29th of April and I visited Cell C Kolonnade again to finalise this upgrade, only to be told that the phone is no longer kept for me, AND that no other branch has stock on this phone. This offer can also not be taken due to the fact that the device is needed to finalise the contract. My question to Cell C is, you advertise a deal until month end, your customer want to take this offer, but Cell C can't deliver? And this even after my second visit, on recommendation. I am more than prepared to wait until the stock is received, but surely the contract needs to be available for me, since I was at your shop before end of the month, as stated and confirmed by your employees. So how is this your customer's problem that you don't have stock, and they are prepared to wait for the phone, but now you tell me there is nothing you can do. No phone, no contract? How is this your customer's problem? Surely this offer should be available to me if I sign the contract, "available until end of April"?</p>