Citibank Credit Card — Un authorized online Transaction

I kumar konda, Having sbi bank credit card .On 6th NOV 2020 My credit card swiped for Rs.1000 at DUMMY ME BT ONLINE. Following message i Got is "Rs.1000 was spent on your card on 6th NOV 2020 at DUMMY ME BT ONLINE.This transaction has been processed without the additional factor authentication prescribed by RBI". But i have not done any transcation on this day. I given complaint for this and blocked the card. Actually there is a Balance Transfer facility from other bank credit card to sbi credit card, i requested HSBC credit card customer care to pay the amount of sbi credit card using BT specility, after rasing this reqeuest, after 2 days the above dummy transaction happend, so i blocked my sbi card and called hsbc customer care about this dummy transaction, now they are saying simply this dummy transaction was done by me, but this hsbc people not intimated me about this transaction, i thought it was fraudlent transaction and blocked my card, this is the mistake of Hsbc cc department. without saying clear instructions this transaction was happen...