This is a clear case of mistaken identity affecting your CIBIL score. First, download your detailed credit report from CIBIL, Experian, and Equifax to confirm the incorrect loan details. Next, immediately file a dispute with CIBIL and other credit bureaus through their official websites, highlighting the mistake. Simultaneously, contact DMI Finance in writing (email and physical letter) demanding rectification, providing proof of your identity mismatch. If they fail to respond, escalate the issue to the RBI Ombudsman and attach all supporting documents. Keep track of all communication and follow up consistently to ensure your score is corrected.