Cunts used to do this shit at Starbucks all the time.

"This isn't a macchiato."

"Sure but Starbucks thinks it is. You can tell me how you'd like your drink or I can refund your drink."

Worked 99% of the time, unless someone just wanted to argue. In that case, they just got refunded and asked to leave. Our store was almost all regulars and we didn't have a drive-through, so we didn't have to deal with this shit much.