Excuses for using scan to pay

Every time I go to Checkers Hyper Pavilion and want to use the scan to pay option I get some excuse. I used to always use scan to pay at the store however some cashier gives dumb excuse one was if the payment goes through twice that's your own problem. Today I went to the store and I requested for scan to pay they chose tap to pay. Cashiers in the store have a don't care attitude. Even when the manager came she spoke to the cashier something in Zulu and when I told the cashier tap to pay is different from scan to pay she said I must scan the phone. How the hell do you scan when there is no QR code generated? You guys really need to go for training. I have noticed that the store always does this. I'm sure I'm not the only customer with this issue