State Bank Of India [SBI] — Losing our money

Address:

Dhana kotulu center ajith Singh Nagar vijayawada krishna

Dear sir
My father has received a message on 24/7/2023 saying the amount of Rs 10000/- got deducted from his account from what seems to be a SBI SMS sender ID (BP - SBIKBP). Same repeated in 19/9/2023 So, he immediately went to the bank to check his balance and his balance was in fact Rs 20000 shorter and we raise the complaint regarding the same in the same branch but to no avail as the manager and rest of the staff has mentioned it is a fraud case where somebody somehow did balance transfer and that the money wouldn't come back. kindly help us in this scenario