Reddit, I was subject to unlawful discrimination due to my criminal background. How should I proceed?

I was recently semi-employed by a large company, which then fired me without informing me (they had my name crossed off of the schedule when I came in for my first day, I actually had to figure out I was fired by myself) after they performed a background check. It says clear as day in the paperwork for my background check that they're not allowed to do that without informing me that was why they rejected me.

My friend, who is employed there, passed the information as to why I was fired to me after he spoke with the manager about me (without my prompting, I didn't know why I was fired at first). My friend told me that the manager had told him I was fired after the results of the background check came back.

Currently, I am assessing how to proceed with this. While I would like to simply speak with the management, I'm unsure of what I would get out of it, since all I want is the job they won't let me have.

The job was washing dishes in the cafeteria of my university. My university contracts the company to take care of all food-related stuff on campus. After I applied, my name was immediately put on the schedule to work the next week. However, when I showed up, my name was suddenly crossed off of the schedule. I never filled out any paperwork, aside from the application and the consent for a background check (which made no mention of background impacting employment opportunities).

I was sent a copy of the background check, which included a list of my rights, and essentially said that they could not reject me based on my criminal background without informing me that they had done so.

Should I talk to someone at the school? Someone at the company? Or should I just let it die?

I don't really want this to be a big thing, I would simply like an apology for their mishandling of the situation, and in a best-case scenario I would like the job that I applied for.

What do, Reddit?

TL;DR A company hired me, and then fired me post-background check without informing me of why, even though they were legally required to.