why did you go above your manager's head? to the gm? if your supervisor said it was wrong then..you get the picture. kind of like if mommy says no then let's try daddy to see if he says yes. regardless of what the issue is. that part right there is just beyond wrong. supervisor says no, that is it. this isn't a visitor safety issue that needs to be addressed immediately but a policy one ..something that seems firmly in place.

obviously their policy is to have customers not use the kiosk and they are pretty firm about it. can't imagine it is a new policy...so while you might have had the best of intentions, their store policy is no kiosk. it must be a huge issue for them to send you home..much more then is stated here...

what you could have done is simply stated as you did, "she's bringing up my draw, I just started my shift (or what ever) and i'll be ready in 2 minutes. thank you for your patience." I assume the kiosk thing is right there so if they wanted to people would see it on their own and order from there.

customer service is just that...their figures must be based on people interactions, or perhaps the kiosk doesn't mesh well with other systems in the kitchen , regardless, now you know..face time with the customer is what is important.