http://www.consumer.ftc.gov/articles/0149-debt-collection (Threatening civil proceedings with no intent to follow through, or threatening criminal process in order to collect a civil debt is a violation of the Federal Fair Debt Collection Practices Act.) The same goes for endless telephone harassment
Also contact your local attorney general
Last known address:
Diversified Consultants, Inc.
PO Box 551268
Jacksonville, FL 32255