Scam call about enforcement action.

I keep getting them Kelly. How do I stop it?

Scam call from Treasury Dept for IRS. Gave agent badge #, said needed to talk with Supervisor for process to purchase Tax Pay Voucher for $4000-$6900 with cash only and mail immediately to avoid Warrant for my 30 day no-bond arrest.  Had to stay on the line until the process was complete.

Scam call with threat of action by IRS if monies are not paid.  Hung up when advised the call was being recorded and forwarded to appropriate IRS Fraud Unit...

How so I stop these calls?