I received the same calls. First a threatening voicemail which I knew had to be a scam but irritated me so I called the number and he wanted me to keep him on speaker phone and drive to get money while talking to him. I taped the conversation. I finally told him to get a real job and to quit scamming $$$$ off innocent people and he hung up on me. They try scare tactics.
I got a call from 607-324-9764 and it was an automated message telling me it was the IRS and they were going to sue me that I needed to call 347-901-5203 to get more information on this claim
I got another call from 607-733-6833 on my cell phone with the same automated message saying they were the IRS and I needed to call 917-310-1313 for more information
I received an automated call from 347-901-5203 saying they were the IRS, and this was a final notice - that the IRS was going to sue me. Strange how it was left on my cell not my home phone.