Start here - http://www.sss.gov.ph/sss/index.html
It is the official web site of the Philippine Social Security System. Here you can get a directory of branch offices, download SSS forms and register to access your account online.
If you still have questions about your SSS data or membership you can use the SSS automated telephone service by calling the SSS IVRS at 917-7777 or call 920-6446 to 55 to speak to an SSS representative from 8:00 am to 5pm, Mondays to Fridays.
You can also email SSS at firstname.lastname@example.org