What I do in this case is to bridge in the Jolly Roger phone service. This is an automated anti-scammer bot that keeps the caller on the phone. The Jolly Roger phone number is 214-666-4321. I bridge in Jolly Roger and it was quite comical listening to the Indian caller try to have a conversation with Jolly Roger :)
I just received a call from this number saying it was an enforcement action from the United States treasury and that they need me to call them. But they did not give my name.