Mistakes happen...BS! If they had put antifreeze in your engine during an oil change, they'd have to fix the problem. This cop had his head up his *** (nothin' unusual there). Ideally, you'd have called a tow truck to haul the car to a dealership to have the gas siphoned out and then charge the f'in gas station for the bill (probably have to take them to court for that. Unfortunately, not worth the time or effort.) Too bad the system works the way it does. Looking at the bright side, your engine will probably be fine. In the future, I'd be standing outside the car during the filling of the tank to verify what's being put in.