This company is a joke and quite frankly should NOT be in business, and how much longer they can carry on, given the amount of BS they seem to cause each and every person that unfortunately goes to work there, is anyones guess, not long I would say.
They are liars, cheats and theives and cannot be trusted in anyway. About the only thing you can say with complete certainty is that you WILL get messed around and you WONT be happy there.
If you want a decent contract that is honoured and you dont want to end up having your Visa screwed, which may even end up you having to leave China all together then the answer is simple...
DO NOT WORK HERE - STAY WELL AWAY FROM THEM - YOU WILL BE DOING YOURSELF THE BIGGEST FAVOUR THAT YOU HAVE EVER DONE YOURSELF.