Bsnl bandam sim card
Sim card was not working but phone no is used another person the identity is still my address proof

Sir,

i am taken the bandam plan the sim phone no. is 8500147471 still the sim is in my hand but the sim is not working recently im phone to the same no. another person lift the why it is possible? still sim is my hand the sim no8991738116614843583N the sim is taken my identity but know it is using another person the sim is taken in bsnl office Khanapur Adilabad. please solve my problem si