Kotak Mahindra Bank — Credit card charges

I received a kotak credit card [protected] with a limit of just Rs.15000 and that too cancelled by the bank without any reason and none of the staff able to give me a reason. anyways i just used the card once before it got cancelled. it was of Rs.641 and i didnt receive any update on statement and payment related message. later on August 5th i receive an alert of overdue on account. immediately i made the payment. August 2nd was suppose to be my due date which i came to know later. thn these bank has levied around Rs.600 as late payment fee and denying to reverse the charges. i request you to take immediate action and reverse the charges as none of the bank officials are able to help me out. thanks MD NIZAMUDDIN KOTAK CREDIT CARD [protected] MOBILE : +91-[protected]