Help me girls

This guy wants me to send him a nude pic but I have already told him that I have a boyfriend and he's threatening or blackmailing me that he's going to call his uncle who's a cop and his aunt who's an FBI agent only because I dont want to send him nudes or semi nudes. Can someone help me I'm freaking out and I'm scared!

Update: Thank you girls for helping me go through this! I have already deacitvated my kik account have made a new one. 😊😊😊 Thank you