SBI Card — Fraud transactions in my credit card

Fraudulent transaction of Rs 49000(in 6 transactions) happened with desc as AMAZON SELLER SERVICES MUMBAI IN on my SBI credit card on 1st Feb 2021 for which I did not receive any OTP over SMS or email and I did not receive any communication regarding these transactions. On 3rd Feb 2021, I got the SMS from SBI saying that my credit card has been blocked because of some suspicious transactions. I logged in to SBI portal and I reported all the transactions as dispute. I immediately called the customer care and backed the card permanently and reported about the fraud transactions. After that I raised the complaint with Bangalore Cyber police(CIR no-CIR000819).

After that from 9th Feb 2021, I am getting the mail everyday from SBI saying that their investigation is done and I am liable to pay for the transactions as it happened securely(with otp). After that I am asking for proof of investigation everyday but not getting any reply from them.

I never got any SMS or email with the OTP for those fraud transactions and now they are forcing me to pay this huge money. I am asking for the proof but they are not even sharing that. I am really under so much pressure as the amount is huge and most importantly not done by me.