To the one guest who may have been accidentally double charged -
I apologize if that is the case, but I am not allowed to just let you leave the store without verifying this is in the POS system. (I love saying over the walkie, "LOD, can you check POS, my system just crashed." Most guests just look at me like I've lost it.) If your sale doesn't show up in POS, I have to re-ring your items. Please, please, please, do NOT come back into my store later on that night and throw your card and receipt at me like a grenade, yelling at the top of your lungs. I am not deaf, I was on the phone with another guest. Wait your turn. I apologized, do not call me a b*t*h. I'm sorry you're a single mother and your kids are hungry, but it's not my fault that you have no credit on your card. If that was the case, you probably shouldn't have been buying movies for you, makeup for you, or clothes for you. The only food item on that receipt was a candy bar that I watched you eat.
It made my night when you wanted my manager. He's the one who checked POS. He's on my side. Do not tell him to just return everything off your receipt without having the items here, especially since it still wasn't showing up in POS four hours later. Your guppy face was hilarious when he said, "I'd be more than happy to double check this tomorrow for you, I'm here from 9-530." Which, conveniently, is when you said you could be here. But, my smile stretched from ear to ear when you had to reach across my large service desk counter to grab your card and receipt because that's where he left it.
So, guests, be nice to us, we'll do everything we can to be nice to you. It's like that rule in restaurants, be nice to your waitstaff and cooks. You don't know what they will do to your food if you're not.