If you have any general question about Credits and Credit packages, please visit this page
How can I see my credit balance and usage history?
To get your current credit balance or usage, Go to Billing > Current Credit/Plan. This new page shows you a table that looks exactly like your bank passbook.
The first row of the table shows the last transaction done. This can be either addition or subtraction of credits. The value under the balance column of the first row shows your current balance.
All the rows of this table show when your credits were utilized or new credits were added. It also shows the final balance of the respective transaction.