Hi,
Thank you for writing to Microsoft Community Forums.
I understand that your query regarding cancel of Azure subscription.
I would like to inform you that you have reached the Windows Technical Support forums, where we help with Windows 10 Technical Issues. We do have a dedicated team for any purchase or refund related queries, let me point you in the right direction. I would suggest you to get in touch with the Microsoft Store Support team and they will help you with the appropriate details.
Regards,
Nikhar Khare
Microsoft Community - Moderator