I got a call from (722) 596-6514 and let it go to voice mail. The message said that "Internal Revenue Services" (it's "Internal Revenue Service," scammer idiots!) was filing a lawsuit and requested that I call (202) 239-2835. Yeah, 722 is a Mexico area code, SURE the U.S. IRS has a phone number from there.
I received the same phone call 1/15/2015 at 9am.
Extremely funny, like you said it's Internal Revenue Service not Internal Revenue Service(s).
To make this even more unbelievable, I currently work for the IRS, and have for the past 20 years. While working (for the IRS) I received this call.
No one ever said these scammers are incredibly intelligent. Plus I referred the number to TIGTA (internal police)