How to stop Robocalls

[Cheri52]

Would like to ask to correct way to complain about robocalls.  I am a follower of the twitter "endtherobocalls" and was referred to a website about current CA law and they said the first place to complain was with my phone carrier, then to file with the FTC and the CA Attorney General.  I have been getting two kinds of robocalls.  The first is from a collection agency whose call back number leads to a company currently under indictment by the Attorney General of WV.  This company is based in OH.  I have filed complaints with the FTC and the CA and OH Attorney Generals.  The robocall has been daily since 9/9/09.  The prerecorded message DOES NOT include the true name of the company or why it wants ME to call them back.  Since we have not gotten a letter of validation as required by FTC regulations, I figure this is an attempt to acquire information about a third party.  I have contacted a class action lawyer and am documenting each robocall.  How can I get verizon to block this call?  The second robocall starts off with "Hello, President Obama ...." and is it a pitch to refinance my mortgage.  This has to be a scam as the company does not have a company name in the prerecorded message and it has no callback number.  This is clearly an FTC violation.  Since I don't have caller ID, I do not have the phone number of this scam.  I just tried to see if maybe Verizon Call Assistant might work to get these scumbags digitally recorded and provide some proof of the call, but when I tried to see if this service was available, after I submitted my verizon account name and password I wound up at a "not found" message  page.  So how do I stop the robocalls and should I file with verizon first?