Are you aware of call blocker technology?
Have you googled/searched for "Call Blocker?
Call blockers are available as phones, apps (some free) and standalone devices.
Remember,
The Do Not Call List is NOT a call blocker!
Here is 800notes' discussion on call blockers:
http://800notes.com/forum/ta-5d4e343675a5629/call-blocking-devices
Here are two pages of links to (mostly government) sites in Canada and the USA were you can report phone scams, or learn more about them.
First, look elsewhere on this site for an Article, entitled "Where to Report Phone Crime". (It may appear in the column to your right).
For a more frequently updated list of complaint sites, with links to government web pages, look here:
http://phonehelp.2truth.com/complaint_sites.html
~~~~~~~~
Please reply to this post, to let us know you read it, or have taken suitable actions to protect yourself.
I believe this is a scammer, one of several with the same routine that's been calling all summer from different number. This call went to my answering maching. Man with aggressive manner left a message, claiming to be from IRS tax fraud warrant office, claiming 'you (did not specify whom he wished to speak with) have outstanding tax bill due to discovery of hidden funds' and that a warrant was about to be issued for 'your' arrest. He damanded a call back at 703-879-7010, and hung up.