Client misleading

Been to dischem in potchefstroom to buy some redbul. The special is 2 for 25.00. So i take a few cans n when i got to cashier they told me its not for that specific flavour. The price tag states its 2 for 25.00 for red bull 250ml. Now where does it stipulate a specific flavour. Staff were very arrogant with us. N this is not the 1st time i had an experience with POTCHEFSTROOM DISCHEM.