State Bank Of India [SBI] — fraudulent use of debit card number

Sir, i received a call from mob no [protected] posing as sbi rep on 31 jul 17 at 1529hrs and sought my debit card number and aadhar no. He asked otp for verification of card number and stepwise sought out six times. When i checked a/c statement through net banking, i came to know that total rs 49997 has been deducted in 6 transactions using posted purchases in mumbai. My a/c number is [protected] and sbi branch code is 006683. I am a serving soldier, posted to air force station bhisiana, bhatinda punjab. Kindly help me