Received a call from them as well.  Claiming they were with the IRS internal tax crime department. Gave me a badge number that was about 20 numbers long before I hung up on him.  Scam for sure.

just got the same call. I said hello and he continued to talk like he was leaving a message, said this message was for "you". I then asked him who "you" was he could not give me my name, just kept saying "you"
How do these people get our cell phone #s. I never give mine out???

received call from my employer asking for help to wire money for IRS debt- said someone would be calling me.. sounded fishy. the indian guy called "jimmy walker"  and said he needed money for medical expenses.  My first clue it was a scam is he pronounced my bosses name incorrect (was supposedly a friend) , his story didn't match up and wanted me to go right away to bank, leaving him on phone while I went in and got the cash to put it on a prepaid card.   Luckily, I was smarter that he and didn't listen.  Called my employer to say it was a scam.  when he called back, I told him I didn't go to the bank, I went to the police.  He hung up!

got a phone call said his name was Jason Clark badge #16108 and he was from tax crime unit IRS.  Said if i didn't call him back immediately good luck.  Def a scam!

Received call today 3/19/2015   Jason Clark with the Tax Crime Investigation Unit, with the IRS.  stated that this was serious and concerned "you" I tried to interrupt him but kept talking like it was a recording.  Told me I needed to call him back ASAAP at 718-337-8776.   I am not calling him back, I think I saw something on the news about these callers.   Once you call back they can tap into all your data.