Extreme disappointment - Stickeez

I went to Pick 'n Pay Edenvale especially to do my shopping today as it is the closest in my area where I work that I could get Stikeez for my kids. They have a large adverti*****t at the stores entrance on how to earn more stikeez when buying certain products. I then made a note of the ones I would use in order for me to get more stikeez after spending more than the required R150 rand. In fact at the end I spent R371.24 to be exact which would give me 2 stikeez. I purchased 4xdrinking yoghurts = 1 extra stikeez + 2xstork spread tub 1kg = 1 extra stikeez, 1xcorn flakes = 1 extra stikeez. In total i would get 5 stikeez. I had to leave without any stikeez because apparently they have to stock. At NO point in the store is any notice that they do not have stock . All the adverti*****ts at the products and tills are up for the stikeez. I tried to speak to one of the managers but they were all extremely busy on the phones and ignored me standing there for several minutes, I had to leave as my lunchtime was over. How do you advertize something that you can't offer. I have now spent extra money thinking that i would receive something in return. EXTREMELY DISAPPOINTED!