Appeal deadline questions after an unemployment denial - 3 months and counting

I got a denial letter last week saying I left my job voluntarily, but I was let go as a mechanic. I worked as a mechanic before this. My employer's version of events does not match mine, and I have emails that show it. Did you bring documents or only talk?

Legal aid offices and some workforce centres help with unemployment hearings at no cost. A call is worth it.