I think you were looking for the wrong thing in Quang Ngai if you know what I mean. There's a huge "sexpat" community in Ho Chi Minh, that might have been a better fit for you. Please disregard that nasty message. It's a great school overall and they do everything they can to make you a happy teacher there.
I agree with Turnoi. What did the contract say? If you have a signed, official contract, you have grounds to pursue this, or at least report this to your Embassy if the employer in question reneged on your contract. I went over my contract before leaving the US with a fine-toothed comb, so to speak. Did you?
Stay away from this crazy thing, BEWARE (forefrontenglish@gmail.com)! Do NOT take a job with Ms. Thao. I flew from Chicago to work for her - $3,000USD for flight and hotels and she decided I wasn't right for her school! EOE! Stay away, stay away, stay away.