How can i get back at this guy?

There is a guy i know who has told me to k*ll myself, has called me a wh*re, a sk*t a sl*g, etc, all on the basis that i didn’t have time for him. i don’t knwo where he goes to school (we’re 17), but i could find out. how do i make sure he gets punished for being so horrible?
Update: i also knwo where he used to work 
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