Sheetz review: Being charged wrong

I went inside to pay for gas because I had 5 cents off on top of my 3 cents and I said $60 on pump 8 at the Canonsburg location on 6/10 at 10:15AM and the cashier charged me for $16. When I said no, that’s not correct she said she fixed it and when I went out to pump, it stopped at $16. I had to go back in and I lost my 5 cents off because she used it on the $16 and never fixed it. I was in a hurry on top of that because I had somewhere to be and I am pissed that I had to pay extra when I used my points for more money off of gas. Something needs to be done about this. Gas is too much and I got ripped off.