Received call from the number 720-472-4697 today. The voicemail says that it is the IRS and this is my final collection notice. If I don't call them back they will file a lawsuit against me. The messaged requested I return the call to 202-407-9896. IRS website says this is a scam.

Got a call today saying that "IRS is going to file a suit against me".  Please call back some number for further details. I could never get that number down that they asked to call back.