Step 1: Click on Monthly >> Accounts from the left side menu of the screen
Step 2: Click on the Monthly Customer Account
Step 3: Click on the Billing Tab
Step 4: Click on Close Account
Step 5: Enter the account number, and select the option you need to clear the invoices (Write off or Reverse).
Optional: If you need to close the account on future dates, you can select the date with the Calendar Selector
Step 7. Click on Close to confirm this action.