You'll have to get a company name and physical and mailing address - then you can send a cease and desist letter - sent certified mail/return receipt so they can't say they never received it.  However, from other posts made here about the same calls in regard to bogus debt, I doubt very much they'll give you their name and address.  If by any chance, they do provide you with this information, please check on Google to make sure it's not just a UPS store or parking lot.  

It is a violation of the FDCPA to refuse to MAIL a debt validation letter showing you owe a debt and that your callers have the legal right to collect said debt.  In fact, your caller only has five days from the date of the first call to MAIL this documentation to you, so by their refusal, you should already know that they are scammers.  Also, if you were going to be served a court summons, a legitimate caller would NOT give you a heads up - the court process server would just show up, unannounced.

Other than that, please print up this forum thread and give to your HR Dept and/or manager to let them know you're being harassed in clear violation of the law, over a debt that isn't yours.  Also, please do report your callers to the FTC, FBI, Dept of Justice and your state's Attorney General.  You can tell your callers you've reported them for multiple violations of the FDCPA and that you also know they're trying to scam you.  The calls may continue for as long as they think they can scare you into paying this bogus debt.

If you are able to send a cease and desist letter to them, and they continue to violate your request, you can file your own lawsuit against them for violations of the FDCPA.

This company calls me and my director and other extensions here at the hospital I work at CONSTANTLY about a debt that they claim is mine.  I tell them to mail me the info or deliver the legal papers that they keep telling me they have to deliver, I will not verify info on the phone so they are brutal in their calling to me and my director and sometimes to the HR department they obviously never show up with the legal papers.  How do I get them to stop harassing me?
Karen  

The Federal Trade Commission (FTC), the nation's consumer protection agency, is warning consumers to be on the alert for scam artists posing as debt collectors. It may be hard to tell the difference between a legitimate debt collector and a fake one. Sometimes a fake collector may even have some of your personal information, like a bank account number. A caller may be a fake debt collector if he:

?is seeking payment on a debt for a loan you do not recognize;
?refuses to give you a mailing address or phone number;
?asks you for personal financial or sensitive information; or
?exerts high pressure to try to scare you into paying, such as threatening to have you arrested or to report you to a law enforcement agency.

If you think that a caller may be a fake debt collector:

?Ask the caller for his name, company, street address, and telephone number. Tell the caller that you refuse to discuss any debt until you get a written "validation notice." The notice must include the amount of the debt, the name of the creditor you owe, and your rights under the federal Fair Debt Collection Practices Act.
If a caller refuses to give you all of this information, do not pay! Paying a fake debt collector will not always make them go away. They may make up another debt to try to get more money from you.?Stop speaking with the caller. If you have the caller's address, send a letter demanding that the caller stop contacting you, and keep a copy for your files. By law, real debt collectors must stop calling you if you ask them to in writing.
?Do not give the caller personal financial or other sensitive information. Never give out or confirm personal financial or other sensitive information like your bank account, credit card, or Social Security number unless you know whom you're dealing with. Scam artists, like fake debt collectors, can use your information to commit identity theft ? charging your existing credit cards, opening new credit card, checking, or savings accounts, writing fraudulent checks, or taking out loans in your name.
?Contact your creditor. If the debt is legitimate ? but you think the collector may not be ? contact your creditor about the calls. Share the information you have about the suspicious calls and find out who, if anyone, the creditor has authorized to collect the debt.
?Report the call. Contact the FTC and your state Attorney General's office with information about suspicious callers. Many states have their own debt collection laws in addition to the federal FDCPA. Your Attorney General's office can help you determine your rights under your state's law.

http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors

I have spoke to an FBI AGENT in reference to this!!!!!   Everyone MUST CONTACT ATTORNEY GENERALS OFFICE IN THERE STATE!!!!!  Upon receipt of this call !!!!  I have gotten the same messages!!!!   This is a SCAM RING OF PEOPLE!!!!!!   Stealing MONEY!!!!!

Just received a call from these people stating i had 2 unpaid loans that i NEVER took out and that they were going to take me to civil court! This is complete BS and I am calling the Better Business Bureau!

Goldman and associates (803) 728-1736 is a collections agency for pay day lenders. Any questions contact Pete Dunlap at that number.

Received a call from an Anna Rivera who said she was an independent locator and asked me to call this number (803) 728-1736 in regards to a legal matter. I called it and spoke to a Pete Dunlap who said he was with the Processing and Summons Division. He wanted to verify that he was speaking with the right person, and after asking several general questions ("Have you ever lived at this address, etc") wanted me to verify the last four digits of my Social security number. When I refused, I was transferred a lady who coincidently was also named Anna who also asked a series of questions and finally wanted me to confirm the last four digits of my SS#. She said that they had the first five digits, but needed the last four to confirm. Again I refused to give out any information.
When the call ended I contacted the S.C. Better Business Bureau and then reported them to the Dept. of Consumer Affairs. After the recent breaches of information here in SC, you can't be to careful.

The person said that I had 2 cases pending against me from Loan.com (I've never applied for a loan from them) and that i was going to go to court if I didn't pay them the money that Loan.com deposited into my (now closed for 4 years) Bank of America account. They've called my mother and my neighbor, telling them that i had put them down as a reference. I didn't even know my neighbor's number. They are total b***s***.

Asking the same question, I recieved a call but no message or voicemail.