Wilco Service Station

Everytime I go to this gas station, I get double charged for something. Usually I catch it in time, but last time I was extremely sick and forgot to double check my receipt. When I returned and told them they charged me for a 4 pk instead of a single item, they said they had no way to check except to look at the video and to leave my name and phone number and they would contact me once they confirmed that I only bought the one item. I went back twice and it has been three days and no one has contacted me. If it were the first or second time, it wouldnt be a big deal, but this happens almost every time I go to this store. I will not go back anymore because I am tired of trying to fight for the extra $3 or $4... It shouldn't be so hard to ring up items correctly anyway. Like, it is literally the easiest job and they keep messing it up.