Absolutely Ridiculous

Today, I went out to Sunway Pyramid and ate at a sushi place. After my squad paid the bill, it seemed too little so we counted it out and it was true. We are good people; we went to tell the cashier that they made a mistake. They only charged us for 6 plates instead of 14. I ended up having to explain to the cashier and even counted the plates that we were charged on our receipt. He still insisted that he was right. I honestly couldn't believe this guy couldn't count to 14. When we counted the plates up on the receipt it only added up to 6 which means we didn't pay for 8 plates. I was really confused how he didn't understand even after counting one by one. We ended up paying for 4 of the 8 plates but didn't pay for 4 because the cashier thought that was it. We just left because he wasted our time. I can't believe I wasted 20 minutes trying to argue and having to pay for their mistake. Can people be really this stupid?