Got a denial letter for unemployment, what now?, IT help-desk technician here

I got a denial letter last week saying I left my job voluntarily, but I was let go as an IT help-desk technician. There are 16 people counting on me, so I am trying to be careful. The letter lists a deadline and a hearing process, but it is hard to follow. Did you bring documents or only talk?

I printed my emails in order and wrote a one-page timeline. The hearing officer kept going back to it.