False advertising/ over charge

Special advertised as 4 whopper meal for R200 at drive through, Sandown road, Table View, cashier 13249 Pepsi was chosen at order station At pay station total was R206. When this was questioned, it was because of the sugar drink, we asked for the drinks that came with the special. After about 3 minutes the order total came to R210.50. When we questioned this amount being even more now, the cashier just waved us off and said she doesn't know. The drinks we got was Pepsi sugar free, yet we still paid R10.50 more than what was advertised. Very unhappy about their service.