RBI Ombudsman(RBIO).
If your issue remains unresolved after contacting Level-1,Level-2,Level-3, OR, if you have not received response within 30 days of lodging a complaint, You may escalate by:
Submit complaint via RBI CMS portal: https://cms.rbi.org.in
Call 14448 (10:00 AM – 5:00 PM).
Email your complaint to CRPC@rbi.org.in
Write to: Centralised Receipt and Processing Centre, Reserve Bank of India, 4th Floor, Sector 17, Chandigarh – 160017.