Hi,
If you purchased a Windows 11 license, it should be tied to the Microsoft account used for the purchase. Please log in with that exact account here: https://account.microsoft.com/services. Can you find the license there?
If not, or if you decide to pursue a refund, your best next step is to contact Microsoft Support directly:
Click this link: https://support.microsoft.com/contactus/
Sign in to your Microsoft account.
Select Windows > Click 'Get home support'.
Type "Chat with an agent" from the text field and press Enter.
Click "Contact support" at the bottom.
Select the product you need help with.
Follow the prompts to connect with a live agent or request a call back.