This is a place of business that they have called and left the message that the irs is filing suite against. It is a scam. Irs sends letters they don't call you on the phone or send emails
I received the same automated call about 15 mins ago. I knew it was a scam because it is unlikely the IRS will ever call. I ignored it and came to this web site instead. I'm just hoping some elder citizen doesn't fall for their crap