

When would my new visa start?
I applied for a Chinese L type extension yesterday (Dec 23) and got a "receipt". The officer said she can only give me 2 weeks extension since my first one only allowed me to stay for 14 days in China. I appealed and asked her if she can give me a 30-day extension because my return flight is on the 18th of January. She said "2 weeks only". The officer said I should claim my passport on the day written on the paper - January 04 2015 (Sunday, they must be closed, right?) There's also 160 RMB fee written in there. Lastly, she said it's not yet sure.
Note: My current one will expire on December 27.
So, my questions are: When should I pay for this extension? How? When would the new one start? Should I rebook my return ticket?
I'm really looking forward to your reply. I need your help. Thanks!