fraud transaction done post recieval of mail from icici bank

Hi,

i received a mail from ICICI bank with subject ” Important notice”, i read the mail which clearly mentioned the below text and a file was attached with the same.
“Dear Valued Customer, Please view the attached file for important update.
——————————————————————–
© Copyright ICICI Bank © All Rights Reserved.”

I opened the file which mentioned Security Update:( as mentioned below)

Attn! Dear Customer,

We recently reviewed your account, and suspect that your ICICI Bank account may have been accessed from an unauthorized computer. This may be due to changes in your IP address or location. Your account will be disable within 48 hours, Protecting the security of your account and ICICI Bank network is our primary concern and that is why your account will be lock.
To unlock your account please Click the below link to activate and protect your internet banking from internet rat.
www.icicibank.com/new-security/upgrade

Important Notice:- Please match your information correctly and carefully to avoid account suspension.
Thank you for banking with us.

Accounts Management As outlined in our User Agreement, ICICI ® Bank will
periodically send you information about site changes and enhancements.

Visit our Privacy Policy and User Agreement if you have any questions.

i clicked on the link and submitted the details post which 3100 rupees were deducted from my account. Now when i approached the bank they are denying for the reversal of money or any mail sent by them. I still have the mails with me

Please help me !!!!! awaiting for your revert