I got the same call, very robotic, said he was Jack Henderson and is sending my case to my local police department for IRS fraud...whatever. I didn't call back.
“Down your case file to your local police department in order to get arrested and all these charges I want you to call us back as soon as possible at my department call back number which is 720-442-7718 I repeat again 720-442-7718 this is Jack Henderson again from investigation department of internal revenue service thank you…”