Sounds bogus. Saying they are IRS dils. Tax fraud against you call immediately. Didnt try the number and im not going to. Had the same call a couple weeks ago from a different number.
I received a call from this number stating he was from IRS, but sounded fake. My name was not used and I'm pretty sure the IRS would not just call my number and not use my name. Also, I think the IRS would send me some written documentation before calling.