Complaint Review: federal crime investigations

i have been getting phone calls from these people for a couple of months stating that i owe money and im going to jail and wishing me good luck. the guy that keeps calling is the same guy just keeps using a different name, i can tell by his voice and dialect. the most recent call i got was i was going to be arrested and going to jail, i already notified the D.A. about this due to being tired of being harrassed by these people, when i asked for paper work they said they were not allowed to give me paper work for legal reasons, and when i said if you think im just going to hand you money and i dont know who you are your crazy, and that day they told me i would be arrested.