This is an outrage, they pose as the IRS and threaten to have you arrested if you hang up. After agreeing to pay them $500.00 to stop a warrant they agreed and after I made the payment they asked for more. I didn't find out it was a scam till I called my lawyer and he said I just lost $500.00. I hope they are found and stopped. I have been advised of how the IRS would handle any uncollected taxes now and it will never happen again. Don't respond to their calls, notify an attorney and report it right away. They are very convincing.