Monthly payments for recurring deposits are automatically debited from the account linked to the recurring deposit, which is why it is better to maintain sufficient balance in the source account. System would check consecutively for 3 days to check if you have maintained sufficient balance. If you have missed paying your recurring deposit instalment on the original date due to insufficient funds in your account, you can pay RD instalment on Net Banking or at a nearby branch. To pay via Net Banking:
1) Login to Net Banking
2) Go to Investment -> Regularize RD.