I don't endorse this behaviour at all I'm merely stating the facts (probably as outlined in the contract you've entered with Microsoft). If you feel you've been wronged you should certainly hire a lawyer. At the very least then you'll know what it is they think you did.

Another option would be talking to a consumer organization (not sure if this is applicable because a university licence might not qualify as a consumer licence).

Other than that: Caveat emptor. I know this sounds trite and doesn't really help in your current situation but when you entered that contract you very likely agreed to the terms Microsoft now uses against you.