I was hired through a contract company for skilled...

I was hired through a contract company for skilled labor. (That should throw a flag for starters.) After having a conversation with someone about being enrolled for college and attempting to go into a different field of work after graduating, I was fired via voice-mail.
They said I clearly wasn't going to be there long term so don't come back. I still have 3 to 4 years of schooling and they informed of this during my interview. I did every task assigned to do quickly and accurately.
The managers do not know how to properly manage efficiently because they are educated. Why fire someone doing a job and doing it well when you are undermanned? Who cares if they plan to retire from your company? Get your manning right then make changes, it's common sense. They shift schedules around as they want and never honor anything they say. Save yourself the head and find somewhere else to work.