Citibank — transaction by an unauthorized person using my credit card

Address:

Mysore, Karnataka, 570023

Respected sir / madam,
On 14.07.2017 i received a telephone call (From mobile no.[protected] suspected later as fraud) that they want to upgrade my citibank credit card and enquired my credit card details.
Unknowingly and inadvertently, i gave the details which i suspected to be fraud when the enquired about my bank details, immediately i called upon citi bank customer service and requested them to block the card immediately. The dispute complaint was lodged vide ref. No.2248 and fraud transaction complaint was lodged vide ref. No.9700.
The credit card was blocked immediately by citibank and subsequently i received a new credit card ending with last 4 digits 8122.
When i viewed my citi bank statement, i was shocked to note that the fraud transactions details were mentioned as unbilled amount and as per the recent statement i am intimated to pay rs.1007.00 as minimum amount to be paid before 07.08.2017.
Hence i request you kindly to eliminate the suspected fraud transactions and take suitable action against the culprit who has misled me as citi bank officer and tried to draw amount against my credit card.
Anticipating reply from your end to put an end to the above fraud transactions against my credit card and oblige.
Thanks and regards,
Gopalan. B. K.
Mysore.
27.07.2017.