While you can consider getting a callback from our Support Team, I can guide you through the process of making an account inactive to address the duplicated expense account, Iwan.
Since we can't directly delete an account, we can make it inactive to have it removed in your Chart of Accounts. To achieve this, ensure that the expense balance is zero. If the balance is not zero, QuickBooks Online makes an automatic adjustment entry to zero out the non-zero balance of the inactive account. You can follow these steps:
Go to the Gear icon and select Chart of Accounts.
Find the account you want to delete.
Select the Action ▼ dropdown and choose Make inactive.