State Bank Of India [SBI] — fraudulent purchases made in my debit card

On 28th june 2017 19 purchases has been fraudulently made and thank you messages were received in my mobile from google. None of the purchases were made by me nor i received any otp for any of those purchases. Every time i make any purchase i authenticate with the otp received. But how google has authorised nineteen such purchases through debit card. Please investigate and credit the amount to my sbi account.