HDFC Bank — hdfc bank credit card unauthorised transaction

Complaint Reference Number: [protected]
The unauthorized transaction happened on my HDFC credit card on dated 06/02/2019 Amount: 3024.23. I called customer care in a few seconds time after the transaction happened and blocked my card. It was an international transaction. I filed the complaint in the credit card dispute department but no response till now and the amount has also been added into my credit card bill with the international transaction tax and GST on it. When I'm calling the customer care to know the status then they are not responding they just keep transferring the call and cut the call at last.