Result is a permanent cancellation? Does that mean the match is nullified or the winner at the time wins? Either way, one team could draw a strategic black card. Seems like cancellation of the match is not the correct outcome. What about penalizing the harassing team? A red card result for the team (down a player for the next game). This seems like an odd way to handle abusive behavior from parents. Abandoning the current game may be good if parents are behaving that way, but there needs to be a serious consequence for the parent's team too. Otherwise it will just be another tool.

Abandoned matches are reviewed by the relevant league, and depending on the reason and circumstances the match can be replayed, resumed, or adjudicated. When a side is judged to be at fault, the outcome is often a default 3-0 loss for them, on top of assorted punishments for the players/coaches/teams involved.

For other kinds of match cancellations with an offending party (example: having too many players sent off), the offending party automatically loses.

I expect it to be the same here, with the referee deciding who the offending party is.

Why are you assuming abuse by parents is solely being targeted at the opposing team’s players? Parents may just as well be shouting at their own kid for what they see as “sub-optimal” play, and at their kid’s teammates for what they see as “getting in their kid’s way.”