Stranger added me on Facebook and got my number?

I've got a friend request 2 hours ago from an Turkish guy, then he started chat with me and said something perverted. He saw my phone number on my wall and he keep texting me. I asked him politely to stay away from me but he won't listen, until I called him and shouted at him said F off and yeah I insulted... show more I've got a friend request 2 hours ago from an Turkish guy, then he started chat with me and said something perverted. He saw my phone number on my wall and he keep texting me. I asked him politely to stay away from me but he won't listen, until I called him and shouted at him said F off and yeah I insulted him badly, but useless. He keep calling me saying perverted things. I want to keep this guy away from me but I can't change my phone number because I have load of important contacts on my phone....

I want to keep him away from me, what should I do?
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