Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Christina, You may be better doing this yourself as it is not easy to get a chat with an Agent. Please go to: https://account.microsoft.com/services You will see your two installations of Microsoft 356. You need to cancel the one you do not want. Here is the instructions https://support.microsoft.com/en-gb/accounts-billing/subscriptions/cancel-your-microsoft-subscription Look for>Manage>Then>Turn off recurring billing. That will stop any more payments on that subscription.
For Microsoft Support go to: https://support.microsoft.com/home/contact Type in>Cancel Microsoft Microsoft subscription (Probably filled in)>Click on Help (you may need to sign in). Then go to bottom of page and click on Support assistant.