State Bank of India — atm card mis use

Some one had used my sbi atm card while the card was with me which is called hacking robbery stealing or whatever and which is quite common now a days..I have lost quite an amount of money and have been running to the bank regularly to get my problem solved being a service man.The bank managers only kept delaying and promising me that your problem will be solved and not to worry.Now after about waisting time for about seven months they say that nothing can be done.
Please let me know what can be done and how can I get my problem solved at the earliest.