Yi,
hang tough. I for one believe you.

The arguments being used against you are totally spurious. The fact that you came over on something other than a Z Visa does NOT put you in the wrong. Thousands of foreign teachers come here every year on the same basis and it's usually fine.

You've done a pretty good job of demonstrating that you had done what you were asked to do by this employer. Even if you had some small errors somewhere, this DOES NOT excuse being told that you didn't have a job after all despite flying all the way there with a signed contract in hand. I'm convinced that you were duped by a bunch of crooks, and you have my sympathy and support.

You're getting bullyragged by someone intent on simply shooting you down, and who refuses to even consider that you might indeed have been ripped off...and then demands that YOU be objective.

Don't let it get you down. After the tirades you've endured your obligations to be "respectful" are long since expired. Go for it.