Thank you very much for your suggestions! I have sent an email to both the China admin centre and the GMAC council in the US. If they can not give me a satisfactory reply I will do as you suggest and let this thing go big!
同学~我这边已经有消息了~具体的解决方案是~北京让我挑个我满意的时间~说是即使满考位也会帮我安排~可谁让我运气好~6好上海刚好没满,所以就安排了6号的考试。而且在我的要求下~美方负责人给我写了一封pdf的官方的揭示信,不知算不算道歉信~因为里面只有一个sorry for any inconvenience.