An employer might have decided they screwed with you enough and will dial things back a bit because they feel in control of the situation and in control of you. But, finding out you're planning to find a lawyer or to file an external complaint may push their hand towards termination.
It doesn't mean you can't continue with a complaint and may end up proving your point about mistreatment, but it sure doesn't keep the checks coming in!
Don't let someone force your hand and force you out of work. Employers are capable enough at that game without outside--or inside--interference.