Blackmail and identity theft

Fake people send messages to others saying they have hacked their phones and fixed them. They claim to have all their data. Just like they did to me, if I don't follow their orders, they threaten to expose me on social networks and tell me to send them my photos, threatening me and trying to scare me. It happened to me; they told me they have authority and sent me a photo of the Kuwaiti police to lie to me.