Keep Getting Calls From An Unknown Email Address (facetime)?

I got an iphone 4s a few weeks ago, and the day after i got it i got a facetime call from this email address i didn't know. I definitely do not know this person, and i don't know how they get my number because the only people i had on my phone at the time were my parents and a couple of friends, i'm 14 btw. I thought it may have been a mistake, and they could have mistyped a number or something, but they keep calling me, i never answered and i would get about 7-8 missed calls at a time. They do it every day and its getting annoying. Yesterday i was at my friends house, i was in the bathroom, and when i came out she told me i had got a call from and email address, and she had answered it. She said that it didn't connect to him she could only see her own face, and after about 3 seconds they dissconnected. Waht is this, it's getting really annoying and kind of creepy now, how can i get them to stop?

Its an advertising email like where they send you spam and stuff. Like those fake money give away emails except the email can't use facetime so it can't connect to you.

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