Please don't listen to all of these folks who are trying to bring conflict into your life. You did something interesting, and learned a lesson about how big institutions actually work. It is a great story, and one that you can tell your friends.

The easiest path forward is to do what it takes to graduate, it sounds like you are one quarter away. Smile, play nice, help out where you can. Get everything in writing.

Definitely TALK to a lawyer and have that in your back pocket. It is likely there is some sort of legal aid through the law school and you can. However, only use this as a last resort. It would be no problem for a university to drag something like this out for months or years and you will be left without a degree.