What should I do ?

My ex and me just broke up and then he added me in a group on snapchat w his friends and then left while they cussed me out and threatened to “bash my skull in” and beat me up??? Btw they are all 16-17 but there was one like 12 year old in there for some reason and I was going to take screenshots of what they say but they all left the group before I could and snapchat deleted everything they said .