I got the same thing as "Not a Sucker". I was worried but then I looked up their phone number and found this. It's really annoying that they call so early.
IRS Scam. Received an early morning voicemail (without a corresponding missed call) from "Frank Jefferson" who had a fake Australian accent and used unusual phrasing and word choices.
"Frank" claimed to be from "Internal Revenue Tax Audit Department" and claimed that several criminal charges of fraud would be filed against me today if I did not contact them settle immediately.
Ditto - 5 criminal charges being filed today. Asked for my phone number, then my name. I asked what name they called, and said they couldn't locate it in their records. Right. I said I'd wait for the official letter from the IRS. <Click>
Just received the same call. The guy couldn't even speak English. Told him if the IRS needs me I am sure I will be mailed a certified letter. Then I hung up