Bad customer service

Went into a Pep store in Mall @ Reds to buy a voucher, whilst I was waiting for my turn I saw a chocolate on display I took it, when I got to the till the chocolate scanned a different price from the one that I saw on display when I told the cashier Naum Moeketsi she gave me attitude and made me feel like I was wrong in showing her that the prices were different, she called a supervisor to void, she gave me the same attitude, even after I showed them that more than 20 items are sitting on the shelves with a wrong price, they made me feel like I was trying to rob them...worse customer experience ever!