In general, it is your responsibility to get a TIN from the Bureau of Internal Revenue. However, many businesses accommodate it for the convenience of their employees.

Since you don’t have a TIN, it means that no withholding tax was remitted to the Bureau of Internal Revenue during the period of your employment. Hence, you cannot claim a refund from that government agency.

You may try to visit http://www.bir.gov.ph or try reaching their call center. You may access the number through that web.