Sunoco

I bought gas at this gas station today. I pushed the regular gas button as I always do for the lowest price per gallon. I was shocked to see that the total was so high. I looked at the receipt, and was charged for the highest cost per gallon. I took the receipt inside, and they told me that the hose of the pump pushed to wrong price button, and that happens all of the time and customers are always complaining. She told me to be more careful and push the button before I moved the hose next time. I don't believe that the hose pushed the button , and am concerned the pump is working incorrectly or there is fraud.