Most of the time it happened when something went wrong with your bank account you are unable to find the right details for the banks.
We have list some popular bank contact details for contacting in case you face any trouble. These are mainly nodal officer bank details
SBI : https://www.sbi.co.in/portal/web/customer-care/contact-us
CANARA BANK : https://canarabank.com/english/complaints/
If you have any query regarding any information feel free to ask in comment section.