About 12 years ago or so when all the meters were still spinning disc style I may or may not have drilled a tiny hole down into the top of the plastic case and stuck a long straightened out paper clip down the hole of the case and through the tiny hole of the spinning disc to lodge the disc in place, preventing it from spinning. That disc spinning is the only thing that makes your bill go up. If the disc can be held in place, your bill amount is at a standstill until the disc spins again.
I may or may not have gotten to know the rough date in which the meter reader came out and then simply removed the paper clip 2 days prior to give myself a small buffer of safe time & also a very small bill as a result. Once the meter reader left, I might have put the paper clip back in and rinse/repeated every other month when they'd come back out.
In one house I lived in it had a very old style glass case as opposed to the plastic ones. I had the option of buying a drill bit that was made for glass, or being a cheapskate and just smashing the fucking thing with a rock/calling them & reporting that the gardeners must have hit a rock while mowing and it needed replacement. Knowing they'd bring a plastic replacement because that was the newer type being used and also prevents that type of accident from happening again.
Then back to the same routine.. drill a tiny hole in the plastic, safety pin the hole and repeat the cycle. I think a lot of older places still have that old style disc spinning model. I might have kept a crusty old rag draped over the top of the plastic case concealing the bent over portion of the paper clip sticking out just in case one of the meter readers had a good set of binoculars, as many of them do(especially if you have an alley behind your house, they just peek over the fence and take the reading from there).
The rag also gave me a way of removing the paper clip without looking suspicious in the daylight if I ever slipped up got too close to the time the meter reader would be showing up. Just walk out there and grab the rag off the top of the meter while making sure to pinch down on the bent over paper clip in the process.