SBI pressurising me to pay for fraud transaction on my credit card

Fraud transactions worth Rs. 53k were done on my SBI credit card in 2012 even though the card was with me. I reported the incident to SBI with a dispute form and blocked card on same day. Also filed a police complaint although they did not register an FIR. However inspite of repeated followups with SBI, they kept saying that they are investigating and after 6 months, they said that since i have not taken any action within 2 months of fraud, i have to pay them. I have email proof that i had sent dispute form on same day and also got an acknowledgement from them through mail. Now they are demanding Rs. 1.05 lakhs with interest since last few years and also threatening legal action through different lawyers. They have sent me 2-3 letters by simple post thru these lawyers so far. I am not ready to settle even for a small amount (which they have offered many times) since it is completely their fault. They could have easily solved the case since the thief had even booked air tickets online with my card. What can i do so that my credit score is also revived to normal and i do not have to pay anything? Infact i want compensation for harassment.