My question is does anyone know of any instances where calling this type of behaviour out as an offence has been used successfully to stop bullying and harassment in this type of situation?
Getting back to the basic question, my answer would be “no” (but that doesn’t mean it hasn’t happened).
The basic tool in a bully’s locker is intimidation. Which means they will have intimidated other owners and committee members too. You could call them out by seeking mediation and an action at the Tribunal to have them removed from office or their position on committee. It probably won’t work but it will sow the seeds of discontent and maybe even rebellion among other owners.