Shell

While at the gas station I selected the lo gas for 299 a gallon I was then asked if I wanted to receive 3 cents off. If I put it in my phone number. I select yes, put in my phone number. And the price changed to 296. I then place the nozzle into my tank to pump automatically and jumped in the car. Because I was filling up when I got out of my car to an amount of $67.12. My car is ARDX acura. I have never paid $67 more likely. $40-50 dollars to fill up my tank. I then went inside to explain to the attendant at the counter what happened? He just looked at me and said that I pressed the the powerV button, when I know that I did not. When I placed the pump into my tank. It's said $2.96. My receipt reads as duplicate, what is that so? I need Corporate to assist me in this matter please.