Who called from 2063363540

Voice Message left in computerized voice threatening me  with an IRS investigation.
Calling the number and answered by a man who identified himself as an IRS agent and began to give me a identification number. I am a senior citizen, and I told him this was a SCAM, to stop calling my number, and I was going to report this number. The next day, they called again. The number appears on the screen as from Washington DC.

left message, something about being charges against my name????? number 206-336-3540 Seattle WA

I get a call from this númber at least 5 times a week

I get a call from this númber at least 5 times a week

They say that the IRS is pressing charges in my name