If you have been denied new credit because of your existing bad credit then you will save time and money by following these three steps.
"If the completeness or accuracy of any item of information contained in a consumer's file at a consumer reporting agency is disputed by the consumer and the consumer notifies the agency directly of such dispute, the agency shall reinvestigate free of charge and record the current status of the disputed information, or delete the item from the file in accordance with paragraph (5), before the end of the 30-day period beginning on the date on which the agency receives the notice of the dispute from the consumer."
"...a consumer reporting agency may terminate a reinvestigation of information disputed by a consumer under that paragraph if the agency reasonably determines that the dispute by the consumer is frivolous or irrelevant, including by reason of a failure by a consumer to provide sufficient information to investigate the disputed information." The law requires that an agency notify you within 5 business days if they determine your dispute to be frivolous or irrelevant. The law does not dare to define what is grounds for making such a determination except for "failure by a consumer to provide sufficient information to investigate the disputed information."