Take my salam.i m rubel.bangladeshi.I get money...

Take my salam.i m rubel.bangladeshi.I get money from someone.his name is Asad. Pakistani. I paid him 3200 dirhams for my brother visa. He did not give visa. He does not return money and passport. Then I complain to police station. The next day he returns passport. Didn't pay. But he says he will pay after 1 week.already gone 2 months.He has not paid yet. He is keeping his phone switched off. I only have his whatsApp all voice & his car number.Now how do I get my money back.plz help me for this subject plz.his number +971526648299.but switch off.