RBL Bank — Unauthorized Transaction in my RBL credit card

In my RBL card I have got with 3 no’s o[censored]nauthorized of Rs 30500 in three transaction with in 3mins while I am sleeping. The sequence of the transaction as follow’s

1) 1st transaction[protected]:49 Received OTP for Rs 10100 and unauthorised transaction made without my knowledge.
2) 2nd transaction[protected]:52 Received OTP for Rs 10200 and unauthorized transaction made without my knowledge.
3) 3rd transaction[protected]:52 Received OTP for Rs 10200 and unauthorized transaction made without my knowledge.
Got a call from RBL bank customer card regarding the unusual transaction at[protected]:55 and I woke up can came to know I am loosing money in my RBL credit card. Immediately I have blocked the card and raised a investigation request (Ticket Ref. No.[protected] with RBL bank.

Subsequently I have filed a FIR with cyber crime regarding this unauthorized transaction.

But RBL(Ref. No.[protected] has closed the investigation that the transaction is OTP enabled. The Bank was not taking any responsibility on the amount lost since I have not shared the card and OPT with anyone. This three transaction happened with in 3min while I am sleeping. Kindly do a detailed investigation on this and credit the money back to the account.