Appeal deadline questions after an unemployment denial after 16 years as a customer-service rep

I got a denial letter last week saying I left my job voluntarily, but I was let go as a customer-service rep. I am in Spokane, in case local advice matters. 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.