Gas Pump Skimmers
If your credit card number is stolen you simply contact the provider and they will (usually) refund any fraudulent charges and send you a new card. In turn, the credit card companies simply do a charge back to the gas station (taking the money from the station and refunding it to the customer whose card has been stolen).There is no charge back to the gas station, the cards are used to steal other things. They were just skimmed at the station.