Hi and good luck with your endeavors.

You have a couple of contradictions in your post though. Evidently you are a recuriter or somebody trying to represent Filipino teachers in China, at that particular school. Those employers that you complain about will find your contradictions, and those of the teachers involved, and use them against you (and the the teachers.)
In 2b, you mention that the employers have 45 Filipinos and 15 native speakers, and you state the employers reject and terminate native speakers because they have high standards. But throguhout your post you complain that the employers are dishonest and manipulative. That's pretty contradictory. Maybe the employers are hiring Filipinos because it is so much cheaper to hire them than to hire native speakers? isn't that what you complain of throughout your post? You impugn your own argument when you contradict yourself like that, and your embassy and Gloria aren't going to be helpful if you are trying to be as deceitful as the entitiy you are countering.
Also in 2b you give us the sentence, "...so what's the difference between Native Speakers and Filipino Speakers, modesty aside Filipino teachers are better if not the best than these native speakers the company can proved that." Hopefully, the teachers you are representing can use better grammar.
Throughout your post you complain of the employer of those specific teachers, of how they were forced to sign contracts, etc. But you also give it a slant that at least part of the problem is because of native speaker teachers. Be careful about that, because you will lose the sympathy and empathy of their collegues, and is prejudicial in itself.

Good luck with whatever it is you are trying to accomplish, but be careful of what you write and say; it can come back to haunt you like the spirit of an unlikable relative.