If you win a case under the Fair Credit Reporting Act, the credit bureau is supposed to pay for your attorney's time. Therefore, attorneys who handle cases of this type often take cases that look good on a contingent fee basis. You may need to pay the filing fee and other out-of-pocket costs. There is no way for anyone to tell how how much a hypothetical lawyer will charge. To find a capable consumer protection lawyer near you, go to the National Association of Consumer Advocates (www.naca.net).
Disclaimer: This site exists to provide information only. It is not legal advice. Answering your question does not create an attorney-client relationship. I am a Massachusetts lawyer. Any information provided on this site does not, except as explicitly stated, imply familiarity with laws or procedures peculiar to your state which may differ from those where I practice.