The Three (3) Major Credit Bureaus:
www.experian.com
www.equifax.com
www.transunion.com
Know your rights when it comes to your credit:
Collection Agency Out of Line, Report it:
Federal Trade Commission- FTC
https://www.ftccomplaintassistant.gov/FTC_Wizard.aspx?Lang=en
Better Business Bureau Online
http://www.bbbonline.org/consumer/complaint.asp