Who called from 5146478893

I got a call from this number, no one talked when phone is picked up.

J'ai recu un appel de 514-647-8893. Juste un bruit de fond quand j'ai repondu.

I just got a call from that number, no one talked when I picked up.

CONTINUED

because I got a call from them and no one answered and I thought it might have been my friend (Jordan's) friend who always prank calls me. If anyone could answer that would be great!

Over the last one month, I have received repeated calls from the number. A couple of times, I picked up the phone and there was no answer from the other end. On Friday (April 8, 2011) I again received a call from the above number but I didn't pick up the phone this time.

I have also received a message from this number.  I say «hello» and there is silence at the other end.  What can be done to stop this person?