Look at them and hope they can read your mind........... wtf
by ignoring him/her
Defecate while in his company, in public. I promise you won't need to say a thing and I guarantee you won't have to see him ever again.
Don't call or message for about 6 months and they should eventually get the idea. xP
send a text message. seems that's how teenagers communicate these days. lol. whatever happened to real dating & talking face to face ??? O.o