Yes this is a scam from 209-243-6009. Believe me this is not how the IRS contacts you. The final notice is also always in writing. Believe me, the IRS is not calling you - you call them and wait on hold lol.
i just called a call from 607.625.9910. they left an automated vm saying it's the IRS and they are filing a lawsuit against me. said to call them back ASAP at 209.243.6009.
glad i google'd this number first and thanks to everybody for sharing this info!