Monster — my account is hacked from monster app

Hacker has hacked my account from monster. And because of that i lost 70000. My monster id is [protected]@yahoo.co.in.
I paid 1700 for monster service. They called with all details of my account and told me that they will refund the money. So made some transaction through phonepay to transfer the amount so that they will verify same and transfer to the same amount. Like that i lost 70000.

How my details are leaked to frauders. Please take care of this in priority.