I'd like to confirm some details to ensure that we're on the same page when it comes to reactivating the account, james.
Are you trying to resubscribe for your QuickBooks Online subscription? If so, you can simply click on the Resubscribe button from the Account & Settings page. Here's how:
Log in to your QBO company.
Click on the Gear or Settings ⚙ icon.
Go to Your Company, select Account and settings.
Go to the Billing & subscription tab, then hit Resubscribe, and fill in the updated billing information.