Hi PaulCooper, thanks for posting on the Community
It isn't great to see that you were continuing to be charged for QuickBooks Desktop after migrating to QuickBooks Online.
Please note that as the products are separate, you would need to request to cancel the Desktop account once you had moved all data and no longer needed access to this.
All subscription-related queries for UK products are handled on our general line 0808 234 5337 (open M-F, 8 AM - 7 PM, free from UK mobile & landlines). Although we appreciate you have already contacted our support team for this, please get in touch through phone or chat so that we can take some account-specific information to check this further for you.