American Express India — fraud credit card

Address: 380001

My self fuzel pehlari and no. is [protected] using american express credit card.Due to hack of email id there is missuse of my credit card on 24-5 of rs 40000 rs for which i call american express customer care and told to block the card and remove my mail id. though after calling to block my card has not been blocked and then after ther is transaction has been made of rs total 35000 for whcih i called customer care and inform. so exeuctive says sir dont worry its zero liable card and you dont have to pay anything, ;So after assurity i was like its ok they have given assurance. but afterwords i recive letter stated that your transaction are don by you and you have to pay for that, Though they not bloked the card they are saying you have to pay. plz do needful as 75000 is big amount for me which i have not used at all. and cant bare the sum as its is not used by me