An robotic female voice call saying that "We have been trying to reach you. This call is officially a final notice from IRS, Internal Revenue Service. The reason of this call is to inform you that IRS is filing lawsuit against you. To give more information about this case file please call immediately on our department number 561-270-8488. I repeat, 561-270-8488. Thank you." Definitely a scam call. The IRS does not operate this way. Do not call the number. Block the number if you can and report it.