HDFC Bank — unauthorised credit card charges

Good afternoon,

This is to bring to your kind notice that for the past 3 months starting from april'20, there has been a debit of rs199 on monthly basis, claiming it be a mandate given to amazon in debiting my card.
Where as please be informed that i have neither given such mandate to amazon nor subscribed to audible gold monthly paid membership asin as claimed by amazon.
I have already written to amazon to stop such debit, but they have further done the same during this month.
I have attached the messages received from hdfc bank credit showing the transaction made and it is clearly without otp /pin.
Request you please stop processing of such mandate and also refund the amounts debited so far.

Thanks & regards,

Deepa l