They called my family members threatening them. Nobody cosigned on anything and they are buying old debt and then threatening people. They call leaving a number saying if you don't call them back they will serve you with paper work unless you call back and pay. This is illegal and CAN NOT BE DONE!! They are NOT allowed to call you at work and harass you. Report the numbers to the FBI and other agencies. Even if you have debt, NOBODY is supposed to harass or threaten you... They are taking it too far... Don't call them back. Contact a credit or debt attorney and get help to handle your debt. We all have some sort of debt and all need help getting over our struggles. If it wasn't illegal they wouldn't call and threaten or hang up on you. They aren't allowed to do anything to you.. Your best defense is to learn YOUR RIGHTS! Nobody can scare you if you know your rights as a consumer. Take the power out of their hands and put it into yours..  

Don't call them back, don't entertain the idea of their lies and complain them to the proper authorities...