RBL Bank — fraud transaction on my card on 21/[protected]

Address:

803, Proviso Towers CHS LTD,, 400709

There was 4 nos of fraud transaction on my credit card issued by rbl bank, i reported this to rbl bnk on the 25.04.2019, on the 11.06.2019 i received a letter from rbl bnk stating that this was otp generated transactions so i am liable to pay for the 2 fraud transactions and wiped their hand out, based on the information given to me by rbl bank, i checked with the merchant clear trip, it was informed the following;
1. Clear trip trip id[protected] ticket booked on 22.04.2019 at 01.07 am email id [protected]@gmail.com
Passenger names : travelled from mumbai to delhi
1. Ms. Saima k airline pnr d3jgqv
2. Mr. Aslam za airline pnr d3jgqv
The tickets have been booked using following mobile number [protected] land line number [protected].
The total amount is rs. 37, 560/-
2. Payu biz trip id[protected] ticket booked on april 22.04.2019 at 01.02 am email id [protected]@gmail.com
Passenger names: travelled from mumbai to jaipur
1. Mr. Manoj k: airline pnr gbl1yy
The tickets have been booked using following mobile number [protected]
The total amount is rs. 15, 065/- please note as per clear trip this ticket payment has not been done it is stuck. Please hold this transaction
Also the rbl bank has given an overdraft on my card transactions