OP: I am not a lawyer, and more importantly I am not your lawyer, but I would suggest caution before making legal-sounding threats, lest you weaken your position or make yourself vulnerable a legal proceeding against you. In particular, no court would ever expect a mass-refund to be processed this quickly, and you've provided no documentation supporting any assertion that you've demanded a refund, nor that any class of users has demanded a refund.

I'm sure that if you contact Square-Enix's customer support and made your grievances known along with your desire for a refund, then they would be happy to revoke your license and process said refund for you.