Unfortunately the majority of these calls are coming from India and Pakistan. There isn't much can be done since we have no jurisdiction in those country's.
Report the Calls to the real IRS here:
IRS: http://www.irs.gov/
http://www.irs.gov/uac/Report-Phishing
[email protected]
http://www.treasury.gov/tigta/
http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
http://800notes.com/forum/ta-8c2f64bf2b91fa5/irs-warns-of-telephone-scam
•If you owe federal taxes, or think you might owe taxes, hang up and call the IRS at 800-829-1040. IRS workers can help you with your payment questions.
•If you don’t owe taxes, call and report the incident to the Treasury Inspector General for Tax Administration at 800-366-4484.
•You can also file a complaint with the Federal Trade Commission at FTC.gov. Add "IRS Telephone Scam" to the comments in your complaint.