Kyalami park kfc

went to KFC KYALAMI PARK yesterday and I ordered all star box which at the drive thru it displayed as 72.90 but the cashier said to me the system says it's 74.90.. i am very disappointed that the advertising on the store is false and misleading customers.she further more said the prices changed a month ago but why is it that the store didn't change its display..this is not the first time this has happened I have encountered alot of issues with the store and I tend to give them benefit of the doubt but nothing seems to be changing if it's not the food that is not well cooked,it's the bad service we get there. why is it that they advertising is wrong and does not match of that the system is saying