Hello Kaushik, 

All payments for CSAB 2019 have to be made through the SBI MOPS Payment gateway. If your debit card isn't working, here are some alternative payment options you can exercise to pay the fees through MOPS - 

• Net Banking through State Bank of India or any other Associate banks.
• Credit cards or State Bank ATM-cum-debit card
• SBI branch

All the Best!