Originally Posted by Woolybugger
at the very least you can write an email to the tournament director and your section office detailing your observations. it may not rise to the level of a formal complaint, but they will be placed on a "watch list" and be closely observed by refs or undercover volunteers. also, if other parents write in similar observations, they will definitely be red-flagged.
I can confirm that writing cheater up to the section works, especially if multiple parents do it simultaneously. I remember a case of pretty bad behavior and I knew that multiple parents wrote emails. Next sectional the offender was moved to the demo court with a chair in the beginning of expected competitive match. It was the only match in the tournament that was chaired and accidentally this was all done in front of an Ivy coach who came to watch this player. This player is now in college but not attending any Ivy.