After completing all the steps mentioned in the a/c closure email,

1. Please reply to that same email confirming every step is completed, post this your account will be closed. 
2. After all other closure requirements are fulfilled, your account will be temporarily unfrozen
3. You can then add funds equal to or greater than the pending charges. (If applicable)
4. The outstanding amount will be automatically deducted.
5. After successful deduction, your account closure will be initiated.
6. The account is typically closed within 3 days after this step.