Nobroker Technolgi — Fraud Transaction on my Credit Card

Hi, My wife saw a best deal on Facebook of Rs. 500 showing source as Amazon website . When she tried to buy it, it took to Amazaon website however while completing the transaction an amount of 20259 Rs was debited from credit card instead of just 500. I got message from HDFC bank that 20259 Rs debited from my account to NoBroker Technologi. Strange thing is that i didnt get any message from NoBroker Technologies, nor Amazon, nor Facebook about product. It is totally fraud, in place of 500, 20259 got debited, Message from HDFC says, amount is credited to NoBroker Technologi. Kindly Help.