U can only pay whats due. That too after txn settles. For example your this month's bill was 10k and u already paid the 10k. Now u spent another 10k and u wanna pay that too. In this case wait for 2 days until that 10k u spent settles. Now u can pay off the new 10k due.
But u can not overpay. Like ur current total due is 10k, u can not pay 20k. learned the hard way.