Axis Bank — Fraudulent Transactions

There were Fradulent Transactions in my Credit card. I have informed by return mail to axis bank that all the transactions after[protected] were fraudulently done by unknown person by hacking (Presumption) or by axis bank person (Doubt).
I asked them to block card. They advised me over phone to cut the card in to pieces and contact nearest axis bank branch. The Branch persons at Attapur, Hyderabad informed that their branch does not deal with CC and asked to visit Ranigunj branch. From the ranigunj, Secunderabad branch I was directed to go to some othe Branch. In that branch also no one was able to give me details.
I had to shout at them and why are they not able to show me a solution. Then one of them informed that all the CC issues are dealt by CC department at their head office and to contact head office by mails. I told them that I had already asked axis bank by reply mail confirming about fraud and already requested to block card and had already cut CC card into pieces as per their advise. I have been billed again in July 2017 and Axis bank recovery department have thretened that they will file a case agaist me and spoil my CIBIL Rating.
How can Axis bank be so careless about action on fraudulent transactions even after informing? How can they continue to Charge interest on Disputed Transactions for non-paymen\t.