Called my cell, but hung up on my voicemail. Called my parents (old contact # for me) and left message on their answering machine. Said his name was David Cushman, and something about a "pitney case claim" and made it sound like I was going to be sued if I didn't respond. Found listings on "whocalledyou.com" saying they are scammers, and try to collect outdated debts using intimidation, and trying to collect debts that the people don't have.

Read up on your rights here and also make a complaint at this government site:  http://www.consumerfinance.gov/

Also file a complaint with your State Attorney General's office.
List of State AG’s offices:   http://800notes.com/faq/attorney-general

Called and threatened me with asset seizure and litigation.  Lied about the client they represent (I called the client they claimed to represent and the client denied this).   I hired a lawyer.