This is extortion dressed as debt collection. Could be the usual US lawbreaker or a fake collector from South Asia. Try to get a business name and share it with the readers. By federal law this name cannot be withheld.

On 800Notes in the ''Debt Collection Calls'' forum is a thread titled ''Fake payday loan collection scams - Please list new numbers here [2]''. My notes and advice on the payday loan collection thugs from Oct 2011 can be seen on the lead page.

See also this FTC alert:
Who's Calling? That Debt Collector Could Be a Fake

The following will be useful if you have a US domestic collector calling:

official FTC guidance and staff opinions on the FDCPA, PDF copy of the Act:

CFPB reiteration of the Fair Debt Collection Practices Act:
 Nov 03rd, 2012
This people called me the other day and told me if I dinot pay 500.00 that I would have to go to court, or to jail.I need this stoped. I get these kind of calls all the time and its getting very old.
mary vicory
 Nov 03rd, 2012
I received this same message today. I deleted it too. I hope they rot in jail!
 Oct 08th, 2012
It's a recorded message that gives me an affidavit number and tells me to contact my attorney. I deleted the message.
 Oct 01st, 2012