Won’t Leave Until It’s All Gravy

Me: “Can I have a gravy chip, please?”

Cashier: “Is that all?”

Me: “Yes, just the gravy chip.”

Cashier: “£1.60”

(I pay and he gives me my ticket. A few minutes later…)

Cashier: “Number 11! You want salt and vinegar?”

Me: “No, thanks, just the gravy.”

(At this point I can physically see that there is no sign of any gravy, and I’m annoyed because I’ve stated no less than three times that I want gravy. I don’t like confrontations, but I’ve had a crappy day at work and I’m craving a gravy chip.)

Me: “Is there gravy in this? I asked for gravy.”

Cashier: “No, I didn’t charge you for gravy.”

Me: “At this point… should you be charging me for gravy?”