Who is calling

said that they were from the IRS and that my tax return had errors

I have a CT phone number, and I live in Honolulu, and I was called by the IRS Office in CA?  Didn't pass the common sense test to me.  I checked the IRS homepage and it is plausible they will call, but they will ALWAYS send a letter to your most current address confirming any audit or required records.

This number is NOT registered at IRS.GOV:  http://www.irs.gov/uac/Contact-My-Local-Office-in-California

I suspect this is a FRAUD call.  I will be watching my mail for any IRS letter, but will NOT call this # back.