International Magazine Company Repeated phone calls Largo Florida

These people called me 7 or 8 times a day. I answered once and no one was on the other end. So, I called the number back, and the woman who answered asked me for my name so she could find out why the company called me. She then went on a spiel about how I had won a sweepstakes and could have all these magazines mailed to me for "absolutely no charge". I asked her how she got my information, and she just said, "you were just randomly selected". She then asked me to choose between four magazines. When I paused, because I knew she was going to try to sell me something, she proceeded to yell over the phone, "HELLO! ARE YOU STILL THERE?", very rudely. I told her which magazine was interesting and she said she'd give me a great deal on it for only $4. I knew this was BS. So I told her I wasn't interested. She quickly said "ok, bye".
Well, guess what, I got 7 calls from them the next day! I looked "IMC" up on line and found other Ripoff Reports. I'm not surprised.
How do I get these fools to quit calling me? I did check my bank accounts, and so far they are clean. I just wonder what information the have on me. I didn't verbally give any info, but I'm still worried.
Beware of these Jerks.

Bethany
Austin, Texas
U.S.A.