Hello, is there someone else in this situation? My parcel is stuck in Shanghai since 12 september, last update: mail has left [Shanghai International Exchange Bureaul and is being sent to the next stop. What should I do? Please help

My package LZ786015936CN has been stuck as “ Shanghai, Arrival at Shanghai International Mail Exchange (via)” since April 13 after being bounced between several regional sorting centres back to back. It was supposed to be here by the 27th at the latest but instead it’s been back and forth around China since the 8th and now is stuck in Shanghai. I contacted the seller and they said they can’t do anything. Is it lost? What do I do? It’s a $70 package.

Hi
My parcel, LZ410973801CN, appears to be stuck in Shanghai. Latest tracking information is:
Shanghai, to shanghai exchange station (transit).
What does that mean? Where is my parcel now?
Thanks