1. This is the full tracking of your parcel:
China Post Register Air Mail Tracking System
Parcel No.RF441747221CN tracking result
2016-11-17 14:03:47.0 Electronic Data Received
2016-11-19 18:25:02.0 Shenzhen city international parcel process center received
2016-11-19 21:02:00.0 Shenzhen city international parcel process center customs scan
2016-11-19 21:06:00.0 leaving Shenzhen city international parcel process center
2016-11-20 01:50:13.0 Shenzhen Transit Station export security scan
2016-11-21 02:19:39.0 Shenzhen Transit Station export customs scan (domestic transit )
2016-11-21 05:08:02.0 Shenzhen Transit Station export security scan
2016-11-21 16:32:26.0 Shenzhen Transit Station export customs cleared
2016-11-22 14:50:00.0 arrive Guangzhou Airport
2016-11-22 15:04:21.0 leaving Guangzhou Airport going to next airport/seaport
2016-12-07 15:12:45.0 Shenzhen Transit Station export security scan

2. There is 2 possibilities here: either your parcel has a difficulty passing the Security or Customs check or your parcel with the mail bag is not having room on an Aircraft to depart China.

3. You should contact seller as soon as possible and ask him to find out what is going on with your parcel doing the yo-yo between Shenzhen and Guangzhou.

Hope this help.