I Had the same call but it was pre-trial intervention program. I contacted the police and the feds to find out if there were any warrants just to make sure they both said this is a SCAM. DO NOT GIVE THE ANY INFORMATION! I was receiving calls from a Brian and the caller ID said state of Ohio, and I am not even in that state or close to it!
Report them:
http://www.consumer.ftc.gov/articles/0149-debt-collection
Also contact your local attorney general
If they continue to bother you, tell them that you know this is a debt scam and that you are making a complaint to the police for extortion. Once you get a copy of the police report and they call you again , just read out the file number and the name of the PD or Sheriff’s office involved. Tell them you’ll be glad to send a copy to them at whatever address the jack***es are working out of now. If you can find them.