Received call from Mr White threatening federal prosecution for default on loan.  Would not provide name of his company nor of loan company.  A little concerned that he knew last 4 of my SSN & name of my bank.  Became belligerent when pressed for information.  I've never defaulted on a loan.

A caller may be a fake debt collector if he:

•is seeking payment on a debt for a loan you do not recognize;
•refuses to give you a mailing address or phone number;
•asks you for personal financial or sensitive information; or
•exerts high pressure to try to scare you into paying, such as threatening to have you arrested or to report you to a law enforcement agency.

If you think that a caller may be a fake debt collector:

Ask the caller for his name, company, street address, and telephone number. Tell the caller that you refuse to discuss any debt until you get a written "validation notice." The notice must include the amount of the debt, the name of the creditor you owe, and your rights under the federal Fair Debt Collection Practices Act.

If a caller refuses to give you all of this information, do not pay! Paying a fake debt collector will not always make them go away. They may make up another debt to try to get more money from you.

Do not give the caller personal financial or other sensitive information. Never give out or confirm personal financial or other sensitive information like your bank account, credit card, or Social Security number unless you know whom you're dealing with. Scam artists, like fake debt collectors, can use your information to commit identity theft – charging your existing credit cards, opening new credit card, checking, or savings accounts, writing fraudulent checks, or taking out loans in your name.

Report the call. Contact the FTC and your state Attorney General's office with information about suspicious callers.

http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors