This is an idea I forgot to mention. Everytime I call my parents My dad says a place like Pizza hut, Olive Garden or Red Lobster or somewhat. Last year I called them and for some reason I didn't reconised my dad's voice. So when he said Pizza Hut I hung up the phone. Then few mins later I had my Husband call and my mom answered the phone and said it was my Father all that long. So when a Telemarketer calls you say Pizza hut or Dominos or something. They will freak out and probley hang up the phone.