Citi Bank — fraudulent activity

Address:

Begumpet Branch, 500016

Today i have received an sms rom citi bank with the statement saying we confirm ecs debit on your citi account no xxxxxx4556 on 12 nov-19 for an amount of rs 7500 which is a fraud. I checked and found the amount got deducted from my citi account. I have done no ecs and most informative and alarming is its showing hana bank as the creditor which
Name i have never heard of. How to get the money debited back to my account.? Whuy on earth most of the posts shows is this kind of happening is with citi banks only is quite unfortunate