HDFC Bank — hdfc bank amazon 1258399 fraud, amazon deducting money without otp

I have received an alert on 21/07/2020 saying rs. 999.00 spent via credit card without otp but i never did that. I made a call to hdfc customer care and asked for details of the transaction, he replied saying amazon has done that mentioning "standard deductions".

I am not sure what are these standard deductions and why are they deducting without any prior notice. I tried to reach out amazon customer care but not possible.

Please stop this and refund my money. Following is the message i received.

Alert: rs.999.00 spent via credit card *6903 at amazon1258399 on[protected]:19:57:39 without pin/otp? Not you? Call*