Billed Incorrectly

Good Day

I just went to kfc in Rembrandt Park (Drive through) and ordered a plain small ice cream and had to rush back to work ,upon arriving at work i noticed my slip is written that i ordered Orea Treat for R18,90...Why is that ?How much is even this plain ice cream?i couldn't go back considering my Time and petrol.Im not happy about this at all .I feel charged for something i didn't order and i want it fixed .