Extension of Stay....

Hello
I am holding a Singapore passport which allows me to stay up to a max of 15 days in China (Visa Free).
However I will be in China for 25 days in total. I am currently in Australia and tried applying for an entry permit before my departure at the end of Oct. Due to the forth coming meeting in China they are temporarily suspending application for overseas passport holder. I was wondering can I apply for an extension of stay when I am in China. I am entering without an entry permit but can only remain for up to 15 days.