False advertising

I went to buy stationery at Game store Jabulani Mall yesterday as I was taking advantage of the promotions they had. In particular, I was also interested in the Pritt glue stick 43g promotion which are being sold for R99 for a Packet of 3. Bargain right?! However, they had a buy 3* 43g Pritt glue stick and Pritt multi tack for R99. Even more of a bargain! Except, they did not have the Pritt Multi Tack. Meaning, if you take those 3 Pritt glue sticks you will have to pay R175 since they ran out of the multi tack. Is this fair Mara!!! How can they run a special and not have enough stock??? How do u order more Pritt glue sticks and less Pritt Multi tack if you running a special on both for R99. Drove all the way for nothing. What was even more surprising was the fact that online they never spoke of any Pritt Multi Tack. The special online is for the Pritt Glue stick which goes for R99 for 3*43g. This is just false advertising. Ended up not taking the Pritt glue stick as it felt like day light *******!!!