ICICI Savings Account — Cash debited by bank without ATM withdrawal

Hi,
I would like to register my compliant against ICICI bank for ditching a cash amount of Rs. 1800 from my account under ATM withdrawal (10 11/01/2010 NFS/CASH WDL/10-01-10/10:55:22/0 DR INR 1,800.00 ) . While asking the details about the withdrawal I've been told that it is withdrawan using your atm card, however while asking about the bank atm name, i was not told about.
After my threat to lodge an FIR, the call center person agreed to register my compliant.
I was told to wait for 15 days (till 27 Jan) to get an update. I didn't get any update till 29th Jan and hence i again wrote a mail on 29th seeking resolution, on 30th i'm replied with a simple text "According to the revert received from the department concerned, the transaction is a successful transaction as the same was re-presented by the acquiring bank. Hence we will be unable to reverse the transaction"
Pl advise me further action to resolve the matter.