I want more support with this!

I wrote about a guy at work who called me an asshole in front of a bunch of my colleagues, and we still haven't resolved this. I am getting annoyed. My admin friend promised to mediate a meeting so we could come to some agreement on how to deal with each other, but that's not happened. One time an appointment wasn't made, so I didn't know which day to show up. Not my fault. This is why our system makes appointments! So I got her to reschedule for today, and she didn't show! Neither did he. I am annoyed. They obviously both knew we weren't meeting today, and no one told me. This pisses me off. I want this resolved. If she won't meet with me, then I will go to my union and get the rep to meet with us. I wanted to handle this quietly and quickly, and it's being drawn out. Pisses me off. Good leaders need to either be where they say they will be, and/or cancel appointments they can't make.