State Bank Of India [SBI] — SBI Credit card Cheated and not provided NOC even after full payment

I was using SBI CREDIT card. Every month i pay my outstanding on time. but still my statement they mention Fine charges around Rs.[protected]/-. when i called to customer care they said to reversal in next statement. After 3 month s due to same situation i requested to close my card and i did complete payment . they rejected my request and said you have 5500 fine charges outstanding, after this payment they will close so i paid 5500 on same day and make request for close, due date was 28 Nov, but for closing this card i paid on 21 Nov. Still in next statement they included Rs. 2500 as fine charges and reject my request even complete payment and even before due date. when i call to customer care they have no reply for this. They cheated us. they are doing mentally harassment .