Canara Bank — Cyber money fraud from my a/c no.[protected] at sector-6 canara bank branch, dwarka, new delhi.

Address:

New Delhi, Delhi, 110075

I am working as teacher in kendriya vidyalaya, sector-5, dwarka, new delhi and my salary account no.[protected] is working at sector-6 canara bank branch, dwarka, new delhi.
On 4th april 2016, i received one call from canara baank asking for deactivating my debit card due non-using from a long period, on my registered mobile phone .I requested him not to deactivate my card.
After this my account debited by rs.1, 22, 199/ in multiple transactions(About 30) without my knowledge and without any otp received my me.
I do not understand how these transactions happened without otp, i believe these transactions are illegal and should be investigated at your end and my money should be returned.