State Bank Of India [SBI] — my father lost his 12 lac rupees from his account through debit sweep

Address:

Yavatmal, Maharashtra

Dear sbi,

My father had noticed that his account has been debited with 12, 000, 00/- rs through debit sweep. He has just checked his account balance but the money is already debited from his account and he never given his atm pin to anyone nor he had given any otp to anyone, so how it is possible to debit this much of money without any permission from bank. Their should be any protection of money or restrictions to debit money from bank side so it's important for us to have some safety from bank.
Please resolve my problem as soon as possible and revert me back with the appropriate solution for this.
Thank you...