Let me guide you on how to remove the credit card and ACH in QuickBooks Online.
You can go to the Accounting and settings section and deselect the Payment option. Let me show you how.
Go to the Gear icon.
Click the Account and Settings, then select Sales.
In the Invoice payments, click the Pencil icon.
Uncheck the Accept Credit Card and Accept ACH.
When removing the payment options from your invoices it will also permanently remove from Payments account.
Also, to further assist you, I'd suggest contacting our QuickBooks Payments Team. An agent will be able to look up your account securely and provide additional information in turning off your ACH payment.
Also, you can browse our QuickBooks Payments FAQ. It provides a list of articles that may answer your questions in QuickBooks.
Fill me in if you have further questions. I’ll be around if you need any help.