Fraudulent transaction by someone from my account

Hiii Sir, i am having current account in HDFC Gurgaon Branch and i was issued a Debit card along with password for the transaction by the HDFC BANK.On 29/3/2016 at about in b/w 7:20am to 7:46am from Ghaziabad and Sahibabad someone Fraudulently used debit card and withdraw 80k from ATM booth Ghaziabad and Shahibabad as per bank records.It is most astonishing that debit card was in my possession even then also the fraudulent transaction was made from ATM booth, Ghaziabad, which is big fraud and cheating by someone may be from HDFC BANK. Kindly assist me