Charged more money for a small burger.

Busi from KFC Mamelodi Denlyn her service and her colleague was very bad. I ordered a meal which was R64.90 and she said they don't have cups for the coke that goes with the meal. She suggested that I should take a buddy cold drink I will only pay R66.90. When I checked my order I was surprised by the burger they gave me. Her colleague said Busi gave me the R54.99 burger + mash+ gravy =R 90.80. I payed for the R64.90 but given a R54.99 burger. I was charged R64.90 for a burger that comes with a wing and some meat but I only got a burger which looks very small.