Sadly, your situation is the standard operating procedure in China. They treat their own citizens with similar contempt. China invented paper, and for too many employers in China it is just paper, irregardless of whether or not there happens to be a contractual agreement written upon it. eIt can be used in the toilet, or in your parrot cage, as they don't tend to see a distinction between toilet paper and contracts. One world, one dream and one large supply of bog roll. Keep spreading the word, and bring the shame upon China which China deserves for lying to every well-intentioned foreigner who wants to come here to share their knowledge. The fact is, China is a very racist and socially stratified society, though they like to pretend this is not true.

Many Western nations are willing to admit that they have inequality, but Hu Jintao, and grandpa Wen are part of a system that pretends that they treat everyone equally, contrary to incontrovertible evidence to the contrary. Ask the people from Xingjiang who lost their internet for the larger portion of the year so they couldn't complain about their plight. Ask the people who don't long to the Han minority if they feel that there is an all inclusive society in the country created by was, conquest and assimilation of unwilling subjects. They probably won't tell you what they truly feel, because they want to keep their jobs and stay out of prison.