ICICI Credit Card — Infinite finance charges by the bank

Address:	Ghaziabad, Uttar Pradesh, 201016
Website:	www.icicibank.com/Instant-Credit-Cards‎

I have a purchase of Rs. 40649.79 and due date 03/05/2016, I have made a payment of Rs. 40500 /- & same received by the bank 26/04/2016.

The difference of the balance payment is only Rs. 149.79.

In next month of billing statement the bank charges an amount of following

Intrest charges : Rs 1160.55

Service Tax : Rs 168 .28

Purchase of the month :Rs 1834.97

I have made a payment of Rs. 2000 instead of Rs Rs. 1984.76 (Rs. 149.79.+ Rs 1834.97)
Request for waive of additional charges bu bank denied for waive off.
I requested to bank please give us the detail of the balance payment close the card.
Bank official send the mail that the total amount outstanding in your credit card account is Rs. 9690.69 as on June 13, 2016.I have made the same amount of Rs. 9690.69 on June 13, 2016.Now I received another mail that shows the complete due amount on your credit card account as on date is Rs. 386.24, due date is July 3, 2016.
Please suggest.
Regards.