Contact information:   Customer service hotline: 400-666-8655 (service time 9: 00-18: 00)   Beijing Branch: 010-56035128   After - sales service: 0316-5103998   Official microblogging: //weibo.com/worksungroup   Feedback: http: //ac-info.cn/server-36.html   Beijing Marketing Center Address:   Address: Room 503, Building 3, Nood Center, No. 138, South Fourth Ring Road, Fengtai District, Beijing   Langfang Headquarters Address:   Address: Langfang City, Hebei Province, left the town on the north side of the bridge 188 meters