http://www.consumer.ftc.gov/articles/0149-debt-collection (Threatening civil proceedings with no intent to follow through, or threatening criminal process in order to collect a civil debt is a violation of the Federal Fair Debt Collection Practices Act.) The same goes for endless telephone harassment
Also contact your local attorney general
If they continue to bother you, and you know you do not owe any money, 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.
You'll probably have to yell at them and talk over them.
You have to get tuff with these people because, being akin to thugs, brute force is (metaphorically speaking), the only thing they understand.
Here is the email I received this morning to my work email.
Dear Customer,
Kindly verify your mailing address, as the legal charges are already filed and we are going to send you the court papers, so that we can confirm the mailing address before sending any important legal documents.
Just to remind you, this is regarding the e-mail we sent you earlier to download the legal case against you and we did not receive any prompt response from your end to set up the payment and to avoid the charges.
For any questions and concerns, do get back to us so that we can help you with a solution if indeed you want to get rid of the consequences. You can e-mail us back. We work from 9 AM EST to 6 PM EST.