Miscellaneous topics that do not fit into specific categories.
Hello,
Do you use Android or Apple device? If so, you might want to check your Google account or Apple account as well, if you subscribed via Google Play or Apple App Store, it will show up there instead.
Otherwise you can use the instruction here to see if you can recover forgotten Microsoft accounts: https://support.microsoft.com/en-us/account-billing/forgotten-your-microsoft-account-username-b2049472-3b8f-27d3-61c6-67a668453f4c
If you still cannot find it, it is best and actually easier to dispute this with your credit card company.