This number called my son's cell number and asked for me (his mom). How is it possible for someone to know his number when I don't even know his number yet?

I get these calls, and when I call back, no one answers

they called me and cursed me out when i wasnt interested

they have been calling twice a week for months. i finally took a chance and answered, they said they were from a bank in California and i had won a prize! i asked why and she said because of my great credit....yea right, wrong person for that!!! i said i was in a meeting and couldnt talk, she hung up on me. 2 weeks without calls went by but now they are back at it.i dont answer now,

Got a call from this perky girl saying that my credit card company was thanking me for being a good customer and had entered me into some stupid contest that ends on December 31st, I asked her which company and she wouldn't tell me, then she said she already had "free gifts" for me, which were a pile of magazines.  She had my home address and said she wanted to verify it.   I said, I don't want any of that and the twit hung up on me.  SCAM!!!