Sometimes it's necessary to remove recurring transactions and I'll be happy to show you how.
Based on what you've described, it sounds like you set up a recurring transaction for an invoice. QB Online give you an option to either delete or pause the recurring transaction. Here's how:
Select the Gear icon on the Toolbar, then Recurring Transactions.
Choose the transaction or template you want to delete.
Under the Action column, select the Edit drop-down, then Delete/Pause.
Give this a try and if you have further questions, don't hesitate to reach out to our support team using this link.