THE DEBT MASTERS
Posted in:  http://800notes.com/Phone.aspx/1-562-216-8105
Web site guarantees results in 14 days.  Wonder how that works out with following FDCPA guidelines:
http://www.thedebtmasters.net/
No BBB page.
They also claim to be a law firm, but no names are listed to check on BAR regiustrations
California Dept. of State info:
Entity Name:    THE DEBT MASTERS
Entity Number:    C3588027
Date Filed:    07/23/2013
Status:    ACTIVE
Jurisdiction:    CALIFORNIA
Entity Address:    21213 B HAWTHORNE BLVD #5346
Entity City, State, Zip:    TORRANCE CA 90503
Agent for Service of Process:    PARACORP INCORPORATED
Agent Address:    2804 GATEWAY OAKS DR #200
Agent City, State, Zip:    SACRAMENTO CA 95833

Not much else on these criminals at this time.
Federal law (FDCPA) requires them to send you a letter (US MAIL ONLY) within 5 days of their first contact that contains their name, physical address, the creditor’s name, and the amount of the alleged debt.  It also must contains “mini-Miranda” telling you that it is an attempt to collect a debt and that all information will be used for those purposes.  The one other important thing that this letter must also have in it is that you have a right to dispute the debt within 30 days receipt of the letter and if you do so, all collection activity must be stopped until the debt is verified.
Read up on your rights here, get template letters to send and also make a complaint at this government site:  http://www.consumerfinance.gov/
Also file a complaint with your State Attorney General's office.
List of State AG’s offices:  http://consumerfraudreporting.org/stateattorneygenerallist.php
California AG’s Office:   http://oag.ca.gov/