HDFC Bank — Charged 999 rupees without otp

Address: 5325/1, mohalla balochan

I charged 999 rs in my hdfc credit card thru amazon 1258399 id before half an hr, who ppl is using without otp/ call detail, please clarify and refund the amount, i called to bank 10 times after 20 mints holding call cut, who is customer care and where