Sheetz review: Service

I went in store to get 2 juices and chips for my child. The line was very backed up and they seemed quite flustered. Once I finally got to the register. The gentleman scanned my order twice and I told him that then once he fixed it, my order was $11.82 and I gave a $50 dollar bill as payment. I had my child in hand so I didn't count my change until I got into the car. He gave me 10 dollars and 67 cents back and no receipt. I went back in to ask for the remainder of my change and he told me without a receipt he can't do that and refused to pay me my money back.