What to do.. HELP ?!?

my friend recently started dating my x... i no longer talk to either one of them and i told them to leave me alone.....they just called me together and did it cuz they knew it would make me mad.. i told them to leave me alone screamed in the fhone and hung up they called again !?!?! how do i get these people to either leave me alone.. or how do i piss them off to the point where they will eff off?!