[Resolved]  State Bank of India — credit card statement interest calculation is wrong

in the statement which has send to me by sbi cards simpli they hd charged lot of money without intimating to me,and also the interest calculation is wrong.i had paid almost half the amount of my due before the due date still they had taken interest for the whole amount,about this i had called to the customer service for the reversal of charges but negative was the repli,they are telling just pay the cash or cancel your card any one you can chose nothing can be done more than this