What to do about harrassment by a debt collector?

Question Details: I have been receiving calls from a company claiming to be a law firm, they are trying to collect a debt from 3 years ago, which I am not even sure is mine. I have asked them to send paperwork supporting their claim and they will not. They started calling my mother and harrassing her, they told her that I stole her SSN and info and took out a loan, which is crazy. I don't even know my mother's SSN. They told her yesterday that she could pay $400 or they would come to her house and arrest both me and her. I called this place and they told me I owe $1000 but they will settle for $582 or they will put a warrant out for my arrest. I was unaware that even if this is in fact my debt, that you could be arrested for non-payment.

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