If you need late registration or endorsement services for your birth records, you might find this site useful:
The website says:
If you requested for a copy of your birth certificate from the National Statistics Office (NSO), and all you got was a notice informing you that there is no record of your birth certificate, we can help.
An NSO birth certificate on security paper (SECPA) is one of the most important documents that everyone needs to have. Unfortunately, some of us have problems securing a copy from the NSO. There are a lot of possible reasons for this but fortunately, we can help.
Maybe they can help you :)
Good luck peeps.