They were leaving me messages and when I called back they wouldn't tell me who they were. Since I didn't call from the # that they called me on they were extremely rude and would not provide any details.
File a complaint with your local LE for extortion. And your best bet is to get a call blocker to stop these calls. Might want to read these as well.
http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
http://www.fbi.gov/scams-safety
http://800notes.com/arts/I2neMkbUAAo/where-to-report-phone-crime