You may have a legal claim, and may therefore have grounds to sue. First, you indicate that there is a contract; if there is, not only is the contract enforceable, but parties to a contract (like your employer) are obligated to act in good faith in regards to the other parties to the contract (this is called the "implied covenant of good faith). Second, if you either relocated or left an existing job to take this job, based in large part of a representation that you would receive educational benefits, your "detrimental reliance" on that representation may preclude them from disclaiming or dishonoring their promises, under the theory of "promissory estoppel." From what you write, it would be worthwhile for you to consult with an employment law attorney about your options.