You can contact our QuickBooks Online Live Support team for further assistance with the payment credited to your old subscription, as they have the specialized tools needed to process the refund and reverse the transaction.
Alternatively, you can use the lookup tool outlined in the Understand Intuit charges on your credit card or bank statement guide to review the charge from Intuit or QuickBooks directly.
If you have any questions, please don't hesitate to reach out on the QuickBooks Community again. We're here to help.