If you can, give us some more details. This COULD be the scam that's been operating from MD phone calls for about six months right now. Here are some details:
This is a group of people currently taking advantage of people across the United States. They go by a variety of names and phone numbers -- some of the names they use include Global Asset Investigations, Worldwide Recovery Services, Worldwide Asset Investigation Services and North American Asset Investigation Bureau (NAAIB). Last year they were operating out of Cleveland, OH, until they were shut down -- the Cleveland BBB named them as one of the top ten scams of 2007 (http://cleveland.bbb.org/WWWRoot/SitePage.asp ... 19642b&art=4334).
You can get more info here: http://www.budhibbs.com/debtcollectorpages/NAAIB.htm.
They will probably continue using this MD number until they get shut down again, then start using a new area code, but the MO is always the same: they call and identify themselves in a way that implies they are either working for a lawyer, the court system, or the police department (all of these misleading statements are illegal); tell you that there has been a civil case filed against you, they give you a case number, and tell you that you must contact them before a warrant is sworn out against you. When you contact them, they tell you that they are investigating a debt that is 10, 12, 15 or so years old; they'll name some bank you've never heard of, or a credit card you've never heard of. They'll have just enough information about you to make you nervous and they'll be phishing to find out more information. They'll tell you that the debt is some ridiculous amount -- let's say $10,200 for an example -- but if you're willing to pay today, they'll reduce it to, for example, $650. But they can't give you an address. Instead, they will ask for your bank account or credit card number. They'll tell you that if you don't settle on the phone with them that moment, a sheriff will appear at your door within 48 hours to arrest you. NONE OF THIS IS TRUE. Complaints have been filed to the AG of OH, MD, TX, NY, and IL, as well as to the FTC, FCC, and the FBI (as they are trying to illegally extort money over the phone). They target the elderly and infirm. Do not speak with them, and save whatever messages they leave on your phone. If you get a phone call, file a complaint online with the following organizations:
http://www.oag.state.md.us/Consumer/complaint.htm
https://www.ftccomplaintassistant.gov/FTC_Wizard.aspx?Lang=en
http://esupport.fcc.gov/complaints.htm
as well as the Attorney General of your own state. Remember: whether the debt is yours or not, you should not be dealing with these people. They are not a legitimate organization.
PLEASE report them -- you were smart enough to google and find out they're crooks; there are many other people out there (especially the elderly) who aren't able to do that. We must all report them in order to keep others from being taken advantage of!