If you receive a phone call during tax season from scammers, it is advisable to disconnect the call immediately - IRS
Individuals who get these scam phone calls are encouraged to: ... Report the incident by visiting the Hotline page of the Treasury Inspector General for Tax ...

Millions Stolen by Back Taxes Scam Calls - Kiplinger
The IRS advises filing a report with the Treasury Inspector General for Tax Administration (TIGTA) by calling 1-800-366-4484. Additionally, you can report ...

Millions Lost to IRS Back Taxes Scam Calls - NYSUT: Member Benefits
Does the IRS contact individuals by phone? Here's how to safeguard yourself ...