It's sad that despite Finin sending multiple reminders to SBM India, the bank usually takes 90+ days to respond to account closure requests. 

Finin assures  you that we will continue to follow-up from our end until we have the bank's reply. 

However, if you wish to directly escalate the issue to SBM, you may do so via any of these options:
1. Write to SBM at customercare@sbmbank.co.in
2. Call SBM helpline 18001033817
3. Email your complaint to the bank's nodal officer at nodal.officer@sbmbank.co.in
4. Write to the bank's Twitter handle @sbmbankindia
5. Raise a concern with RBI directly