I also received this call,from a recorded sound (answering machine), claimed that it is from IRS, I called back , a guy responded me, ask for my name, and then gave my address by mistake, then he said we didn't want to talk to you and it was someone else!
Just like the previous comment, they called in the morning and claimed to be the IRS. Also said to call back urgently to avoid the IRS taking legal action.
I don't understand how they get any money, They leave a stupid recorded message just to stress you out and raise your BP. I have not tried calling yet but I am sure they are impossible to reach. I have at similar scammers call about credit debt that is not real, and a extended warranty on my car. They all have the same style. I must be on the gullible list.