India Post — Delivered my Atm card to wrong person

Address:

Ernakulam, Kerala, 682006

I am sabeer.p.basheer from cochin kerala.my postal pincode is 682006.sbi bank had sent me an atm card through speed post on 01/10/2016.and this recieved in my post office 03/10/2016 (palluruthy post office pin 682006).I keep asking to the postman whether any speed post has come to my address, he always said no.since I got my tracking number I found that the post had been delivered in 15/10/2016 to a wrong person.and they are bluffing now.please do the necessary action to retain my atm card.hopefully