IF I am reading your words correctly, you are being ( for lack of better words ) subcontract, that is illegal ! I had an employment agent / training school in Maoming try that trick. I was shown a school that I would was illegal, bottom line is, I filed charges with the experts bureau and he lost some money and is now blacklisted. Problem solved !

I can see your point, but let's get back to basics. Which situation will be better for Chinese high school students? that must be the priority, and is it feasible?
A) just to have a foreign teacher.
B) to have a foreign teacher and a Chinese teaching assistant trained by the agent who has employed both of them, and pays them both.
C) to have a foreign teacher and a Chinese teaching assistant trained/employed by the middle school, both of them being paid by same.

In practical terms, C) is uncommon. It's so because Chinese teachers of English won't work as teaching assistants for foreigners for the peanuts that agents pay their Chinese teaching assistants to do the same.
Now, back to basics: I've taught for Chinese public middle schools on my own, a hard struggle indeed for both my students and me. My teaching was inefficient and ineffective. I was worn out quickly after a few classes.
B) is the best option for all parties, in my view, given that C) is financially draining to the employer, the middle school, and that's why middle school headmasters in Shanxi opt for B). The middle schools are the ultimate bosses! Remember that, he who pays the piper calls the tune!

First things first, we want jobs that don't work us like dogs nor give us no job satisfaction. If Helen group is only sending FTs to middle schools, that agent should be avoided, as she isn't doing any more than the minimum that the school itself can do. She would be a bottom-feeder!
But an agent who provides both a foreign teacher and a teaching assistant to a public middle school is a necessary agent providing a better service than agents whose only interest is to sell foreign hides!
So, let's not tar all agents with the same brush! Teaching with the aid of a teaching assistant is preferable to teaching alone, provided said teaching agent can co-operate with the foreign teacher. There's the rub!
The RP should name the workplace and the employer. Both can be different, but the information must be accurate!