Maybe they haven't figured it out yet. See if telling them about it will resolve the scotch tape issue. Then drop by to check up on them see if the tape is still there.
If they intentionally keep the tape then that's another matter, but if it was an honest mistake then we can let it slide this time.
Another solution is to contact the owner, Edmund Uy, as per your previous post with his response, and discuss the matter with him. Hopefully it won't happen again. If what he said is true, then they cannot alter the calibration of the pump, but somebody from the city hall should come by and remedy his mistake.