Email them first... then use the local OKC number (toll-free won't work for you from HKG) Airmen Certification Branch normally gets you a response.
This is the link you want. And be persistent.
http://www.faa.gov/licenses_certific...certification/
Contact the Airmen Certification Branch
Office Hours: Monday through Friday
7:30 a.m. to 4:00 p.m. Central Time
By Telephone Airmen Certification Information and Assistance
Toll Free Long Distance(866) 878-2498 Local Oklahoma City Area(405) 954-3261 Government FTS(405) 954-3261
By E-Mail E-Mail Airman Certification Branch By Fax
(405) 954-4105
By Mail
For U.S. Postal Service, Regular, and Priority Mail:
Federal Aviation Administration
Airmen Certification Branch, AFS-760
P.O. Box 25082
Oklahoma City, OK 73125-0082