I need some help here! The sender has sent items from China since 7-12-2010 ! And till now, it still hasnt reach me yet! Contacted my PO and they said they have no record on this item, what should i do!

I have the tracking number : RR999470497CN ! (By chinapost, EMS)

The tracking site keep telling me that it got stuck at guangzhou on 12-12-2010!

Sender just keep telling me to wait for 2 weeks! i have $100+ worth of items in the parcel. :( Someone please help me!