American Legal Services threatened to have me thrown in jail Nationwide

 I was off work for a couple of days. when i returned to work i had a message for me that i needed to contact American Legal Services and had the phone number. I immediately threw the message into the trash can because i knew that i dont owe any money or have i done anything wrong, so i wasnt going to call them. Wish i would have kept the number now but i remembered the name. Anyhow couple of hours into my shift I recieved a phone call from some foreign sounding guy possible (indian). Told me that I have criminal charges filed against me, and he needed to know my attorney information. I cut him off and told him to never call me @ work again. He went on to tell me that he worked for the U.S. Federal government and that if I didnt give him the information that he needed than an arrest warrant and federal indietment would be issued within an hour. I told him to do what ever he thought he needed to, but not to call my place of employment again. I went on to ask him what this was in regards to and he hung up on me.