Open Question: I need an Advice on how to ask Financial support?

The Father of my child is qatari. for 2 yrs.he has been supporting us eventually but then later on he declined for so many reason that he discussed which is unacceptable.its been almost a year now.im looking for legal advice to what shall i do legally to earn financial support from my child's father which he is not my legal husband since we are not married but he had sign the papers here in the philippines accepting that he is the natural father of my daughter.