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Are there any rules against penalizing consumers for requesting accurate credit reporting?
The Fair Credit Reporting Act specifies in some detail on pages 50-54 (as labeled in the footer, 55-59 as pages in pdf) the process that occurs when a consumer initiates a dispute.  The safe outcome for the reporting agency is to remove the information in dispute  from reports within 30 days if the reporting party does not certify the information is complete and accurate (with other statutory timelines for communication to the customer and the reporter).   If you initiate a dispute, then the agency is following the law by deleting the reported information, outside new input from the furnisher.  If this is unsatisfactory, you have the following statutory right within § 611. Procedure in case of disputed accuracy [15 U.S.C. § 1681i (d) Notification of deletion of disputed information. Following any deletion of   information which is found to be inaccurate or whose accuracy can no longer   be verified or any notation as to disputed information, the consumer   reporting agency shall, at the request of the consumer, furnish notification   that the item has been deleted or the statement, codification or summary   pursuant to subsection (b) or (c) of this section to any person specifically   designated by the consumer who has within two years prior thereto received   a consumer report for employment purposes, or within six months   prior thereto received a consumer report for any other purpose, which   contained the deleted or disputed information.  The section that binds furnishers of information (§ 623. Responsibilities of furnishers of information to consumer reporting agencies [15 U.S.C. § 1681s-2], starting on page 78 in the footer) places on them the following specific duties: (B) Reporting information after notice and confirmation of errors.   A person shall not furnish information relating to a consumer to   any consumer reporting agency if   (i) the person has been notified by the consumer, at the address   specified by the person for such notices, that specific   information is inaccurate; and   (ii) the information is, in fact, inaccurate. ... (2) Duty to correct and update information. A person who   (A) regularly and in the ordinary course of business furnishes information   to one or more consumer reporting agencies about the   person’s transactions or experiences with any consumer; and   (B) has furnished to a consumer reporting agency information   that the person determines is not complete or accurate, shall   promptly notify the consumer reporting agency of that determination   and provide to the agency any corrections to that information,   or any additional information, that is necessary to make   the information provided by the person to the agency complete   and accurate, and shall not thereafter furnish to the agency any   of the information that remains not complete or accurate. So there you have it: they have to stop reporting inaccurate information, and "promptly" notify the credit agency once they've determined what is incomplete or inaccurate. I note no specific statutory timeline for this investigation.