A Microsoft file hosting and synchronization service.
Hello
If you have let the subscription expired in Sept, I am afraid you wouldn't be able to retrieve your data unless you have a subscription on that same Microsoft account. Even just pay for one month, then get your data, then cancel the subscription. Do this before 6 months from Sept to avoid data being deleted by Microsoft.
You want to cancel the one you made on the wrong account. If you just made this new subscription, contact support, explain to them and you will likely get refunded.
To get help, open the "Get Help" app on your computer (just search for it in the Start menu). or go to https://support.microsoft.com/contactus, Type "Billing" and press Enter. On the next screen, click "Contact support" at the bottom of the page, then choose "Microsoft 365" > "Manage my subscription". You’ll then see the option to chat with a Microsoft support agent who has access to your account to help review the issue.