I suggest you send a copy of this thread to Avis, they're obviously not aware of the law in the country they hire cars out in
http://www.avis.com.ph/system.php?LS...=1223645050467
The relevant bit being DRIVER'S LICENSE
Renter must possess a valid driver’s license which must have been held for at least two (2) years. A foreign driver’s license is valid for a maximum of 90 days from the date of arrival in the Philippines. An international driving permit (IDP) will be required of a renter holding a non - English license."