Aero chocolate not discounted pnp limpopo mall till no 18, bought on Tuesday

Aero chocolates not discounted, on display at till no 18, pick and pay limpopo mall, there was a special where you buy 2 for R38, to my surprise when I get home nothing was discounted and each cost R49, I think wrong item was put on wrong price or it was deliberate or the cashier did not discount, I need my money back