I just went into a restaurant that charges per weight and they weighed mine at more than 1.5 pounds. My stomach cannot handle 1 pound, so I'm pretty sure the scale was rigged. What would you do if that happened to you and you already paid for it?
Once you've paid for it you've had it. I wouldn't go back there ever again. You could report them to the relevant department if you think they're overcharging regularly.
