Got a denial letter for unemployment, what now? after 14 years as a line cook

I got a denial letter last week saying I left my job voluntarily, but I was let go as a line cook. This is my first time dealing with any of this. My employer's version of events does not match mine, and I have emails that show it.

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

File the appeal before the deadline, even if you are unsure. You can gather documents afterwards. That is the one part I would not wait on.