False Advertising! Ster Kinekor Vouchers Not Available

I have tried on numerous occasions to switch my smart shopper points to 2 x ster kinekor vouchers - yet every time it says "all available vouchers have already been claimed, please try again later" I queried this with PNP on Facebook and was told "Hi Stephanie, apologies for the inconveniences caused. Currently Smart Shopper does not have any more Ster-Kinekor vouchers therefore you are unable to do the switch."

HOW CAN YOU ADVERTISE THE VOUCHERS IF THEY ARE NOT AVAILABLE?? How can you say "try again later" if there actually arent any vouchers?? I asked this question and was told "Apologies however we are temporarily out of vouchers and are investigating with Ster-Kinekor . We currently do not have a time frame as to when these vouchers will be available as we are still investigating ." What nonsense - this is unacceptable, false advertising!