If the employer doesn't show at the hearing, you get to tell your side of the story, including a witness if you have one, and that's it.  The hearing officer doesn't automatically rule in your favor, although it does work out that way fairly often.

I'd suggest going back to "work" once you get that hearing date, just to see what happens; either you do still have a job, or you'll be able to testify from that experience that you don't, and that the employer lied about you having quit.  And if you haven't gotten all the pay you've earned, that's a separate claim you can make against them, not with unemployment.