This call threatened a lawsuit from the IRS. Returned call reached a repeated busy signal. This is more than a simple "prank call" but that is the worst we have to identify it on this site.
This call is threatening and is an invasion of privacy, preying on people who are easily manipulated and exploited by companies like this.
Leeches on society. Tapeworms in the gut of America. They and their companies need to be exterminated.