Miscellaneous topics that do not fit into specific categories.
Log into your Microsoft account on this link to check if you have more than one Microsoft 365 subscription listed there, if you find more than one subscription, you can select Manage on the subscription you you do not need and cancel it form there.
https://account.microsoft.com/services/
If you are still unable to resolve the second payment problem, try using the steps they provide on this link to find out what that second payment is for.