Someone is trolling me

So there's this guy I go to school with (we aren't friends. we just know each other because we're on the same team) and he's telling all his friends to add me. Like the "friends" that add me dont even go to my school. So I get random friend requests, but i think it might've been an actual friend from school, but its usually not LOL. He's just a trolling me and i just want him to stop, but I don't even know his league name, but I asked his friends and they told me what it was, but that account hasn't been played since like November 2014.. so I keep thinking that it's not even his account. And I've told him to stop, but he just wants to keep trolling me. The only reason I know that he's been telling people to add me is because when i was friends with him his status was : My main: The next supreme (he wrote something like that). I just want him to stop but I dont know how.. Riot help.