I'm on the DNC list and I get these calls all hrs. What I did was give my family their own ring tone this way if it isn't the ring tone a gave them I don't answer the phone, it's only a single ring tone for my family and it works great.

That's what I did.  Doctor's office, family, friends, my work colleagues, etc.  I assigned them a different ring tone than the default ring on my phone.  That way, when it rings, I know if it's something I need to be bothered with.  If it's a new contact, after I call them back, I add them to the phone's internal list and assign the special ring tone.

I think that's really the only solution.  The government won't stop them, and I don't have any way to track them down to a physical address to sue them, so avoidance is the last resort.

I just called the number back and hit 1 instead of 2. I got a live person, "Georgie" I told her to take me off the list or there would be repercussions. We'll see....

Got a call from this# on 5/16/13 around 2:30.  Just a short voice bleep, remotely sounding like my first name, than silence.  Good think, I never pick up numbers that I don't recognize.  
Perennial Energy, LLC. 1375 CR 8690, West Plains, MO. 65775.
Email form on their front page: http://www.perennialenergy.com/PEI_Contacts.php
I sent them a "thank you" one liner and asked to remove my# from their list.

Great resource here, btw!

Got my 2nd call from this number. I'm ATT. Did not answer it. Put it on my black List.