This is a scam. I returned call and told them I was with the IRS and recording the conversation. They quickly hung up - but alas, now they continue calling numerous times a day.
Received 2 calls today from this phone # 347-305-8095 Automated caller with woman's voice said that I need to call back immediately because I'm being sued???? What? My taxes were perfect. No notice, no mail, no email. This is a FRAUD and a SCAM call!! Don't answer this call or call back!! They are probably trying to get your social security number and all the info about you they can. I did call back once and it rang 15 times. Glad no one answered. The caller says UNKNOWN NAME. Please be careful. Report them ASAP!