My first guess is the subway dude screwed up.Had subway for lunch yesterday and someone in front of me ordered the Fritos sub. They said it was $0.60 more for the fritos on top. Guy said "where does it say that?" and a **** storm ensued. Ultimately the guy paid the 60 cents. The kicker was the actually opened a small bag of fritos (the kind you would get with a meal "deal") took a few out, crushed them up, and put them on the sub.
If you are advertising the Frito sub, shouldn't Fritos be standard on them? That's like ordering a ham sandwich and getting charged extra for the ham!