Magicpin — I'm complaining about the fraud

I was called by a caller who claimed to be the icici bank employee and he said that annual charges on my credit card is applied so he will help me reverse it. He made me download an apk app and asked me to enter the card details and pressurized me to do so he said if not done now I will be paying the annual charge. The moment I entered the card details. 19500 was debited from my card. Although I didn't shared any otp and all.