Same thing happened to me. Received a call from 718-745-5293, which was an automated message telling me it was my final notice because the IRS is filing a lawsuit against me and to call 803-335-2106. Called that number (because I knew it was fake). Some guy with a thick accent kept asking me for my number. Asked him why he wanted it and who he was. Told me his name was Adam Goldman and he was with the IRS. Began to tell him that I know this is fake and I would appreciate if he would stop calling. He then told me to F%^& Off and hung up on me.
Same thing. just now received a robo call from 518-792-9450 pretending to be agents from IRS having lawsuit against me and requesting me to call 803-335-2106.