United Nations Legal Department claimed to have a fraud case filed against multiple members of my family california city, California

This company has called myself and two of my Aunts in an effort to garner personal information about one or all of us. They reportedly represent the United Nations Legal Department (impossible) and say they have international fraud cases filed by us against each other.
The callers have thick East Indian accents, refuse to give contact information, and when you demand to speak to a supervisor they hang up and call back a few hours later with a different caller. They all offer generic names such as George, John, Peter, etc...
These calls and their search for our personal information has led to each of us calling our credit companies and banks to put 90 holds on all transactions, demanding verification of all transactions prior to completion and we have notified the Federal Trade Commission which recommended that we each file a police report.