Extinguish The Behavior

In psychology there is a concept of extinguishing the behavior. It means that you make it clear that the bad behavior will no longer be tolerated. It is the end of the road where no more chances will be given. Sometimes it is as easy as no longer answering the phone. Sometimes it is harder by calling someone's bluff. Either way, things cannot go on as they had before and it is made very clear what will happen.