Hi. I'm currently working for a training center in Shanghai and I resigned about two weeks ago. Now the company is threatening to not give me a letter of release or recommendation. Do these things expire? Can I wait it out? I have studied Chinese for four years and have planned to live in China since I was sixteen. I'm 22 now and I work for a company that has breached it's contract three times and when I plan to leave they are trying to make it so I can't work again. What can I do?