Failed attempt to deliver documents from RDR processing [US]

A voice message from 'RDR processing' claims a failed attempt to deliver documents related to a complaint to the recipient's verified residence and workplace. The caller, with an overseas accent, provided a phone number for contact, but the recipient suspects the call is a spoof due to outdated contact information and the caller's accent. The call led to the recipient's mother in another state being contacted, causing her stress.