I just received a call from Amazon earlier and told them that I was on the Do not call registry .I think that they just called me again .the phone rang three times and then hanged up .I tried calling back after a couple of minutes and recorded message told me to leave a message and (boy did I leave them message) . Since I have been on the do not call list , I have been getting more calls . I think that the Do not call registry list is a way to get all your information , so they can sell it to companies . When you report the number to the Do Not call registry they add it to your list after you have reported it .
Then if you want to stop someone from calling you just go to this site and follow the instructions:
http://www.wikihow.com/Block-a-Call