False advertising and Promotion

Food *****s Market Westgate: They had a promotion where you can win Marvel cups with the Marvel Heroes on. If you have 10 stickers you can get a mug. I have 20 yesterday, after working hard and spending alot of money so that I can spoil my two boys each with a mug with their favourite Marvel Character on. Standing there yesterday, spending my last bit of money for the month, asking for the mugs just to find out that I have to pay R50 extra for each mug. This really is false advertising and a waste of peoples money. I am very unhappy with this since I spend alot of money just not to receive what i worked for. I told the cashier that I wont be paying extra for mugs and she just gave me the stickers back.