Stand firm and you will prevail. This is the way Michael A Rivera administrated and it worked well. A fuck you, right back at you with your garbage, who the fuck do you think you are attitude with knowledge to back him. This doesn't get any more complicated than this. You have to be able to do some time though, if the situation happens. A small investment to administrate later. As the melody goes, "A Notice of Mistake, is all that it takes, to chase your Blues away." Repeat chorus as necessary.