If your initial dispute doesn't work, you have several escalation paths:
File a CFPB complaint: Go to consumerfinance.gov/complaint/. The CFPB is the federal agency that oversees credit bureaus. Companies respond to CFPB complaints much faster than regular disputes, and CFPB tracks complaint patterns.
Dispute directly with the creditor: Instead of going through the bureau, write directly to the creditor's compliance department. Under FCRA Section 623, furnishers have an independent obligation to investigate disputes sent directly to them.
File a state attorney general complaint: Many states have consumer protection divisions that handle credit reporting complaints.
Add a consumer statement: You can add a 100-word statement to your credit report explaining your side of any disputed item. This doesn't change your score but may help when a human reviews your report.
Consult a consumer protection attorney: If the bureau or creditor violated the FCRA (for example, by not investigating within 30 days), you may be entitled to damages. FCRA attorneys typically work on contingency — you don't pay unless you win.
Remember: persistence wins. Many items that survive the first dispute are removed in the second or third round. The bureau and creditor are hoping you'll give up.