Send a demand letter. Preferably from a lawyer or law office. Thats usually enough to make them pay. If after the time specified in the demand letter lapses, and they still refuse to pay, you have legal grounds to evict. I'm not sure but I belive eviction can be done with the presence of barangay officials. Best to have the barangay cap or at least tanods present when evicting. At the very least you have witnesses, they will also prevent "gulo"

Try to video tape the eviction so if they become violent, you have evidence.

Eviction is never easy. Be prepared to just let them go and loose the 1 month rent. They may even ask you to give them time to look for a new place.

Good luck.