Equifax Inc. is a consumer credit reporting agency in the United States, considered one of the three largest American credit agencies along with Experian and TransUnion. Founded in 1899, Equifax is the oldest of the three agencies and gathers and maintains information on over 400 million credit holders worldwide. Based in Atlanta, Georgia, Equifax is a global service provider with US $1.5 billion in annual revenue and 7,000+ employees in 14 countries.
Retail Credit Company's extensive information holdings, and its willingness to sell them to anyone, attracted criticism of the company in the 1960s and 1970s. These included that it collected "...facts, statistics, inaccuracies and rumors… about virtually every phase of a person's life; his marital troubles, jobs, school history, childhood, sex life, and political activities." The company was also alleged to reward its employees for collecting negative information on consumers.
As a result, when the company moved to computerize its records, which would lead to much wider availability of the personal information it held, the US Congress held hearings in 1970. These led to the enactment of the Fair US Credit Reporting Act in the same year which gave consumers rights regarding information stored about them in corporate databanks. (It is alleged that the hearings prompted the Retail Credit Company to change its name to Equifax in 1975 to improve its image.)
The company has been fined by the Federal Trade Commission on two occasions for violating the Fair Credit Reporting Act. In 2000, Equifax along with Experian and Trans Union were fined US$2.5 million for blocking and delaying phone calls from consumers trying to get information about their credit. In 2003, the FTC took Equifax to court for the same reason and settled its lawsuit with the company for a fine of US$250,000. .
The company later expanded into commercial credit reports on companies in the US, Canada and the UK, where it came into competition with companies such as Dun & Bradstreet and Experian. The company also had a division selling specialist credit information to the insurance industry but spun off this service, including the Comprehensive Loss Underwriting Exchange (CLUE) database as ChoicePoint in 1997. The company formerly offered digital certification services, which it sold to GeoTrust in September 2001. In the same year, Equifax spun-off its payment services division, forming the publicly-listed company Certegy, which subsequently acquired Fidelity National Information Services in 2006. Certegy effectively became a subsidiary of Fidelity National Financial as a result of this reverse acquisition merger (See Certegy and Fidelity National Information Services for further information).
Equifax sells businesses credit reports, analytics, demographic data, and software. Credit reports provide detailed information on the personal credit and payment history of individuals, indicating how they have honored financial obligations such as paying bills or repaying a loan. Businesses then use this information to decide what sort of products or services to offer their customers, and on what terms.
Beginning in 1999, Equifax began offering products that help people monitor their credit history, including alerting consumers to the possibility of their being a victim of credit fraud or identity theft. Equifax, and other credit monitoring agencies are required by law to provide US citizens with one free credit file disclosure every 12 months, which may be requested on-line at Annualcreditreport.com.
As of December 2007, the telephone number listed for disputing items on the free online credit report (866-233-4027) is also defunct, returning a "not in service" message when called.
Equifax provides an online dispute form. 
Alternatively you can dispute by mail with a free credit dispute form, which gives the bureau 30 days to respond to a complaint or delete the inaccurate account. Additionally, Equifax must then provide you with a free report showing the updated account information.
The Fair Credit Reporting Act requires all the credit bureaus to change the number published on disputes monthly.