Hi, my parcel (RR929184910CN) was poster 11 weeks ago and I still havent received it. Any advice ?

The last record is on 20/04/2013 at Shanghai International Airport.
It seems that it is stuck in China until today. Maybe you could contact your seller and ask him to contact the postal service.

It was in Shanghai on Sat, 20 Apr and I suggested to ask the sender for help. You can ask him to check in the local Post Office and hope this method is helpful.
Generally speaking, no information can be checked when the parcel is under the checking at custom and on the way to its destination.