Hungry lion false advertising .

I decide to buy a deal when I entered the store where you able to win the vetsak , I was informed they don't have the cooldrink that comes along with the deal neither and they waiting on head office .I asked the lady will she write on my slip that they dont have stock so they I can enter the competition. She said no she cannot, I find it strange that hungry lion finds the need to advise stuff that firstly not in stock and does not find the advertising model being sold in store . And that i don't get a barcode slip but a half slip with only a number