People think pushing this kind of thing is pointless because they assume the therapist has to do something, like apologize. I can say from experience that just telling a therapist what their "treatment" did to me can be empowering. Sometimes it's helpful to stand up to an abuser. Speak truth to power, as they say. Hoping the old therapist will apologize, or a new therapist will validate and approve your feelings, or the licensing board will ratify your complaint… all largely passive and impotent acts that reinforce powerlessness and victimhood (though of course the complaint is less so).