Foxy is most definitely right on this. I only just managed to return home to Europe by the skin of my teeth due to visa issues. Going to a Chinese prison is not even something I'd want to imagine,let alone experience, nor paying a bribe to get out of dodge...

Either leave before your expiry date, or stay and sort it out, costly and troublesome. My last experiences taught me a lot and it simply isn't worth being in China without a foreign linked bank account with a minimum of 40-50000rmb or equiv in foreign currency to get you out of trouble.