Customer service: https://www.dhl.com/de-de/home/customer-service.html
Tracking URL: https://www.fedex.com/fedextrack/
Customer service: https://www.fedex.com/en-us/customer-support/contact-us.html
Tracking URL : https://www.chinapostaltracking.com/package-tracking
If you are in China, you can dial 11185 which is the official service number of China Post directly. If you are outside China, please dial [+86]10-11185 to contact. If you are convenient, you are suggested to go to the local post office to ask your problem or go through related procedures.
Other contact ways:
Address: No.3 Financial Street, Xicheng District, Beijing
Zip Code: 100808
China Post EMS
Tracking URL: https://www.chinapostaltracking.com/ems/
The official customer service number for China EMS is [+86]10-11183. After hearing a short Chinese welcome message, you will hear "For English service, press 8". Pressing 8 and wait for a second, you can connect the customer service and ask your question in English. For email service, you can write to firstname.lastname@example.org.
17 TRACK (all transporters tracking)
Tracking URL : https://www.17track.net/en
17 TRACK is a service to track packages from multiple transporters, they do not provide any customer service.