I'm getting calls from this number frequently. Who is it?

this number calls my house up to, 5 times a day and all at different times. Sometimes they use my name or the use the ficton name ( always the same). I have called and left messages to have them remove my number from their phone list and that has not worked. I have a feeling i know where they obtained my number from and so i have made a call to that org and hope to hear from them soon. This has been going on for two years!

just called my house

calls 3 times per day does not leave message. Will resort to using call blocking software using EZ Voice3.2 and a pc with voice modem.

I was just called by this number and, after a few seconds of silence, was greeted by a guy who claimed to be canvassing for donations from MADD (Mothers Against Drunk Driving).  Because he knew about the amount of a previous donation I made, it sounded legit.