what does it mean?? Beijing Municipality, retained by the Import and Exchange Bureau does anyone knows?

HI

I've returned a parcel from South Africa that needs to go back to (Gearbest) which has third party offices in Fanling. I'm actually not sure what is happening and when it will arrive. Can you help explain please?
Number: EE024442515ZA
Country: South Africa -> China
Destination:
2020-02-06 14:57, Beijing, leaving Beijing Terminal, the next stop ,Beijing Post Huangcun Station) (via transfer)
2020-02-05 19:42, Beijing, Import Swap Bureau Retained
2020-02-05 19:11, Beijing, Beijing International Tianyi Processing Center return, note: security return
2020-02-04 16:10, Beijing, Beijing International Mail Exchange Station Returned
2020-02-04 04:02, Beijing, delivered to air transport
2020-02-04 02:59, Beijing, arriving at Beijing International Mail Exchange Station

Hello dear postmen.
Please give me a number to contact Beijing, Import Exchange Bureau
) 进口 互换 局. My parcels have been there for a long time. It is necessary to find out the reason why he was stuck there.