1. Write a Letter to HSBC Stating that You have cleared all the Dues and attach the Proof and tell them to Upload the Correct Data to CIBIL.
2. Give HSBC 30 Days to do the same, with a copy of your letters marked to Ombudsman of HSBC
3. After 45 Days Pull your CIBIL Report and See, if not rectified, file a complaint against HSBC with the RBI, Ombudsman and HSBC will do it.
But first approach HSBC & its Ombudsman before going to RBI.
Best.