False advertising

new Hungry Lion shop opened at Carlswald shopping centre Midrand, Double up Tuesday 2 x munch burger deals (burger only for R30) tried to order they said it is not on the system and gave me 2 munch burgers at R57.00 spoke to the manager and he also confirmed sorry that deals is not loaded on the system so they cannot give it to us we should pay full price or order something else. this is false adverti*****t and no customer care.