PLEASE HELP I'VE BEEN SCAMMED

I dont know what to do, please help me, this player stole my items, it was like this,
I used the Flash Bumper so some of my friends can build, then at that time im organizing my items I throw my clothes and I was about to put a glass then he was fast and steal all my items... please ban this player ''Defaill'' and fix the Flash Bumper.
he stole my exe, angel wings, fisher hat, fox tail, suit, and black pants
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