INCORRECT PRICING ON DRIVE-THRU DISPLAYS

This morning i went to a store in PMB Raisethorpe to be exact to buy a meal....i found something that sounded good enought to eat so i went ahead and placed my order through the intercom at the drive-thru. The price for the Boerie breakfast bun with a short cappuccino was R32.00 exact, however when the cashier rang up the order, it was R36.50. I love eating from our restuarants locally but if i am gonna be done in for even 50c im not gonna be happy about it. Either this store needs to update their advertising boards on display in their drive-thru or they need to charge the customers the price which is displayed. I did not appreciate it as i had to ask the cab drive for the extra money to fill up for my meal. This is just unacceptable. Please deal with it,