CHARGED CORRECT BUT ORDER IS INCORRECT

Sunday 07/01/2018 went to Mc D in Woodmead around 14h00 ordered food for lunch im from Kyalami went home . it was Garlic foldover ,Double Big Mac and Meduim meals but i received 2meduim big mac but charged for a double luckily was in wendywood after 20h00 went to quick a stupid supervisor couldn't even assist requested i bring back what i ordered wrong so he can give the correct order advised it was after 14h00 and for lunch so the kids have eaten now so he needs to then charge correctly credit the r59.00 to r39.00 he refused said i can come back the following day the person who did the mistake can sort it out so what the point of the Supervisor i wonder if they cant resolve such issues.