How can someone denounce a foreign investor for the exploitation of Filipinos?

Which government agency is responsible other than the Bureau of Immigration for the "misconduct" of foreign nationals? Also I heard that one of these foreigners was a convicted Drug Pusher from Kazakhstan and continues to use and possess narcotics in their home in Paranaque, near Sucat. He works with his brother in law in Paranaque. The brother-in-law is a Lithuanian Citizen. They pay their workers 2000 pesos net per month for embling decors for export to Moscow. I think this is far below the minimum wage.