Talk to the manager of the gas station, and tell them the specifics of your interaction with the staff person when you request the gas and ask them to check with that person.
Current location：Home page > Search results > At a gas station, though I only asked for a certain amount, they filled the gas tank full and I don’t want to pay more than what I requested.
Talk to the manager of the gas station, and tell them the specifics of your interaction with the staff person when you request the gas and ask them to check with that person.