Calls with a bogus message about being the IRS. Calls about 1200 times a day.

Have you considered obtaining a call blocking device, app, or phone?  Google (or your favorite search engine) IS your friend!
Realize that the Do Not Call list is NOT a call blocker!

Here are some tried and true methods for reducing or eliminating repeated spam / scam phone calls:  Click on the Info link, below, to see them

InfoWant to stop repeated telescam phone calls?
Try these alternatives:

1.  Do not answer the phone if you see an unknown number on your Caller ID ... let it go to answering machine or voicemail.  Many telescammers hang up after three or four rings.

2.  If you have a smartphone, get one of the inexpensive or free phone blocker apps at your online app store, and learn how to use it.

3.  If your cell is not "smart", read the manual to learn how to set up a "group".  Assign the scammer's phone number to that group.  Also assign a "silent ring" to that group.  You will not hear future calls from that number.

3a.  Alternately, assign a "silent ringtone" as the DEFAULT ringtone.  Then, assign your favorite ringtones to friends, family, contacts, businesses, etc.  That way, you will not hear your phone ring, even if the scammer changes numbers!  (Disadvantage: if you forget to whitelist somebody, you won't hear their calls, either)

4.  For cell phones or landlines: Contact your phone service provider.  They may have a facility or method to allow you to block numbers.

5.  If you buy things online, you might want to google "phone blocker" to see what devices or apps Amazon or other sites have to offer for landlines or smartphones.

6.  DO NOT call unknown numbers back without checking who called (800notes is your friend)! All that does is verify your number is "live".  Instead, read this:
http://www.consumer.ftc.gov/blog/one-ring-cel ... ing-your-wallet
If you want to report potential fraudulent or scam calls, here are two pages of links to (mostly government) sites in Canada and the USA were you can report those scams, or learn more about them.

Here are two pages of sites where you can report phone scams:
1.  Look elsewhere on this page (probably to your right) for the Article, "Where to Report Phone Crime"

2.  For a more frequently updated site, look here:
http://phonehelp.2truth.com/complaint_sites.html

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Please reply to this post, to let us know you read it, or have taken suitable actions to protect yourself.

They called and left vm that they are the IRS I called back and they ask you to verify.

Called for the second time today. Same audio recording vm. They are changing their #, bc I got a same vm with different #.

Called my work number which is not published outside of organization. Bot call claiming to be IRS and threatened to take action against me if I don't call back immediately. I didn't. Total scam.