Complaint Review: NAFS - National Financial Services

I have received calls from NAFS regarding collection from a family member who does not necessarily live with me, the threats and frequency and flippancey rises to almost a criminal level, abusive messages are left on my answering machine, and when I ask them to stop, the tend to lambast ME and I dont owe them any money at all.   When I refulsed to give out a cell phone number, they (or at least the caller) accused me of multiple acts of coverup.   The next day a snotty message was left on the answering machine.   The FDCPA is apparrently foreign to them