State Bank Of India [SBI] — fraud transaction in my savings account.

I have a savings account in state bank of india, kalimpong branch, kalimpong. On 29th march 2019, around 2 pm, multiple suspicious transactions have been completed against my account with multiple transactions (As rs. 79, rs.799). I have not received any otp (One time password) also to authenticate the transaction. Below is the sms which i got.

'thank you for using your sbi debit card 4021 for a purchase worth rs.799 on pos 99999999. If not done by you, forward this sms from mobile number registered with sbi to [protected] to block your card. You may also call[protected]'

So, i request sbi bank to refund the same amount and credit back to my savings account.