Who's Calling

This is the third time this week this number has called me, there is no one there and then the line goes busy. Enough already.

The same thing keeps happening to me they wont stop calling they never leave a message and when I call back the line is busy.  I tried reverse 411 but it did not bring up anything.  I have been unable to answer the calls because its on my cell when I am working and the phone is turned off.   This started about 4 days ago and so far today they have called 5 times! Very annoying! Does anybody know who this is and how I get off the calling list.  2 years ago I put myself on the National Do Not Call List . I believe it just made things worse.

i have been getting calls from this number and tonight someone left a message singing "voicemail, voicemail, voicemail..."

Normally, I am not annoyed by these telemarketers, but this one sure smells of a##hole. What can I do to send some voltage back through the telephone line when they call again. I just got another call from them, as I was typing this up. "Your call is important to us" and then nothing.