He's a scammer. He is not a threat to you. No one here can make him stop calling.
You say your phone buzzes. That makes me think its a cell phone. There are 2 ways to stop from receiving calls on your cell phone.
1) block all calls from this number. Ask your provider how.
OR
2) put the number in your contacts list. You'll have to give him a name. "Pest" would be a good name for him. Then assign him the ring tone "no ring". That won't stop the calls but it will keep them from disturbing you.