Who called from 4152434108

yea got a call today no message

They've called several times today. They let the phone ring 3 times, then hang up before the answering machine gets it.

It rings my cell phone... no one is there... I try to call the number back... call cannot be completed.

Called me 8 times at work on 5/11/2012,the last time I caught it [I work with machinery,very loud] and told them to stop calling,I couldnt hear anything do to the noise,but they stopped.

They keep on calling from that number 415 243 4108 an they said my name very scary so I hung up, I tried to call it back to see if it was a business but the number was out of order an did not go threw.
I am getting upset who ever these crazies are...Stop calling me if you read this.