Exxon review: Over charged or robbed by cashier

I'm writing to complain of being overcharged for lottery tickets. Last saturday 1/09/2021 I purchased 12 tickets. The cashier asked me if I wanted mega ball or not? I asked what was the difference? She told me she didn't know and that it was $26 dollars. She then gave me 12 individual tickets which I didn't ask for them to be separate. I asked again whats the difference, being confused about the price. She said she doesn't know, she doesn't play the lottery. 
I later returned to the store to ask why I was charged $26 dollars for 12 tickets. She was no longer on shift. The current worker made a copy of my receipt and took my number. I have not been contacted regarding this overpayment/theft.