Just got fired. Now what?

I’m in shock rn writing this. We’re overseas for my partner’s grandmother’s funeral and I just got an email a couple hours ago saying I’ve been terminated.

I’m not in too many tears about leaving the company - I was a fresh graduate with no real world experience/this was my first “real” post-graduate job; the position they hired me for was a mid-entry position (they knowingly hired a college grad) and refused to give me training, mentorship, or any other support than “figure it out” + intern pay (way below the industry average for my position and the responsibilities they were expecting from me). I had emailed them about 2-3 weeks prior stating that I would go back to part-time if they would not raise my pay to industry average (which I understand was probably a very bold thing to do - they had previously revoked a raise they had promised me when transitioning full-time due to not liking the results they were getting - they were comparing my work to their last specialist, who had been in the industry for at least 5-10+ years longer than me). I know there was a big chance I’d get fired for speaking up and putting my foot down, and here we are.

They have since refused to resend me my offer letter. I have scoured my email everywhere for it and it has disappeared, and when I ask for them to resend it, it’s “missing”. It’s now my word against theirs, which is not a great place to be in.

Idk what to do at this point. Working with them has been a major slap in the face and this is just even more salt in the wound for me - I’ve spent so many hours stressed and upset about trying to do this job well and trying to teach myself how to work in this industry just for them to throw things back in my face and, inevitably, get rid of me cause I’d like to not be taken advantage.

Feeling a lot of things, so I think I’m just going to call it a day for now.

UPDATE: Thank you for the advice! I don’t wish I could take back what I’ve done because I think I needed to learn this lesson, and tbh, a small part of me is proud for standing up for myself. It might be self-righteous of me to feel so, but after going through lots of crappy jobs with horrible managers when I was younger, I think I wanted to feel an ounce of control when it comes to my work - although, I recognized this was probably the worst way to do it, considering I have not finished lining up a job, an inkling of myself was proud as well, however stupid that may be in the moment now. Next time I decide to make a stupid choice, I’ll remember everyone’s advice and this lesson! And will not make ultimatums without something to fall back on 🔥💪🏻