Directory Service Deletion Issues

So I was just charged for the Directory Service in December. To solve this, I tried to delete my unused directory and ran into some issues:

1. In Workspaces my directory appears but when I click on the [WORKSPACE_DIRECTORY_ID] I get "directory not found".
2. In Directory Service I see the directory -which only has "Amazon Workspaces Application Manager" enabled... but I can't delete it because I must "Remove all application assignments from Amazon WorkSpaces Application Manager."
3. Clicking on the Amazon Workspaces Application Manager link brings me to a 404 page.
4. In Networking and Security, I see that there's a VPC attached to the directory... so I tried to delete that and can't because it's attached to network interfaces.
5. I can't detach the network interfaces because "You do not have permission to access the specified resource." I can't delete these because "Network interface is currently in use and is of type "interface". Possible owning resource is [WORKSPACE_DIRECTORY_ID]

So I now feel like I've come around full circle on the inability to delete this.... I can't delete the directory because it's attached to an application (presumably attached to the vpc resources) and I can't delete the VPC resources because they're attached to the directory.

The closest topic I've seen is this: https://repost.aws/questions/QUX0Hmd_zRSuugQ82qmyWkuQ/how-to-delete-a-directory-service-that-wont-be-deleted

However, I don't have the plan to allow me to open a technical support case... so I'm now getting charged for something that I can't remove.

Can someone possibly help me with this?