KFC Misleading price display

Today on the 05th December 2020 at 14:35 I went to buy family treat 10 piece at KFC NEW ROAD SOUTH the price displayed was R219’90 but when I noticed they wanted to charge me R224’90 and I enquired about this and called the manager he’s name tag was written Mosses. He also refused to sell me the family treat on the displayed price coz he was saying it has been changed on the system and I explained to him about the consumers act and he’s responsibility to ensure what’s on the system has to match the outside marketing he said he understands it but still refused to sell me the food on the outside price.