A woman with a southern USA accent left a voice mail that said, "This call is in reference to a claim that's being filed against the order for restraint under the act of title 18 of US code and section 1343. To show cause for this restraint you or your attorney need to contact my offices immediately at 877-283-5481."

The search results said the 877-283-5481 number is already a suspected scammer. Searching the results for the title and section of the US code showed that this is a section of the code relating to wire fraud but is also a typical line used by scammers as well who are looking for your credit card number.

The phrase they left on voice mail quoted above is very similar to what others have had left on their cell phones too.

I received the same call and they a lady with an accent left the same message on my cell phone. I get a call from different people all the time and with accents. i am tired of them calling saying i owe them money. what to do?

Report the calls to the FTC, the FBI and your state's Attorney General.  If a caller refuses to mail (not email or fax) documentation to you proving you owe a debt to them, you owe nothing to them.  Let them know you've reported them and also tell them that you are recording them for multiple violations of the FDCPA.  Tell them you're recording them every single time they call you - scammers don't like that.  Other than that, let your workplace know that you're being harassed by scammers and perhaps block their numbers.

calling about repayment of a pay day loan, which I've never taken out.  Has all of my personal information.  

I got the same thing...a pay day loan. had all my information. but could not provide me any PROOF that this loan was actually taken out.