Remember; you got chucked out because you were being treated poorly and stood up for your rights as an employee. You did the right thing, and they are the ones who have done wrong. It might seem like small comforts, but still, it helps knowing that.
In brief, they had you do a job you weren't going to be payed to do, and they fired you because you objected to them screwing you over. Now, contrary to what a lot of people will tell you, you do have rights. And there will be an employer out there who will respect them.
And while it's small comforts as well, see it as an opportunity to get a better job, and work for people that are not absolute idiots.
Have you contacted your union, if you are in one?
Jonathan Canterbury said:
No, if you show initiative, work hard, and don't ***** when you're asked to increase your work load, that's called work ethic and that's how you get promoted to higher paid positions.
In theory, at least.