I think I made the same mistake, as I get at least one call per week that I can find via google with a lot of complaints against it. I've learned my lesson, thats for sure!
In Florida, on my cell. They left a somewhat broken voice mail, "....you need to talk to an IRS representative as soon as possible. Press 1 or 5 now to receive a FREE tax consultation."
Got the same phone call as many above have gotten and along with several of you, if I do not know the number, I will not answer....They did not leave a message. When I called back it said it was WCA Subscriber Services telling me that my house has been selected to receive 2 $25 Walmart cards.