See:  http://findwhocallsyou.com/213-293-2594    Caller at that number requests that you call 213-465-0183  See:  213-465-0183 800notes.

Most likely this group:

LPS Scam
This group of scammers has a long history on 800notes.
Known for:
• Constantly calling you at work when you have asked/told them not to.
• Revealing your debt to third parties.
• Leaving messages and not revealing they are a debt collector.
• Threatening a lawsuit when they do not intend on bringing one.
• Claiming that you can or will be arrested if you do not pay the debt.
• Claiming that a judgment will occur immediately if you do not pay.
• Claiming that they can garnish your wages if you do not pay.
• Claiming that they will put a lien on your house if you do not pay.

Demand a debt validation letter if they call you and demand it be sent by US mail.  E-mail no good.  Of course , they won't do this.
Do not pay them anything w/o such a letter, if you have paid them anything or are  in the process of paying them anything, it might be a good idea to simply stop paying them.  Any credit or debt cards numbers they have should simply be cancelled and new ones obtained.

These people are serious debt scammers.
Report them:  http://www.consumer.ftc.gov/articles/0149-debt-collection
Also report them  to the California Attorney General:
http://oag.ca.gov/consumers/general/collection_agencies10

If they continue to bother you, 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 [***] are working out of now.

Here's their worthless website:  http://lpsgroup.biz/index.html

Per 800notes entry dated 1-12-2014  (888-256-6985)

Address: 333 City Boulevard West
17th Floor
Orange,CA 92868

Phone:  888.782.3660
Fax:       714.894.2787
Email:   [email protected]