Sorry for your loss of your Dad and your husband's illeness.
I'm also new to this forum and donna told me about it as well. Isn't she an Angel.
Now is not the time to make decisions regarding whether or not to go after Hospice so they won't do this to anyone else in the future. Your energy and resources much be focused on grieving and recovering your emothional resources and on being there for your husband.
My husband Gene has Cirrhosis and esopageal cancer. He spent seven months in hospice but miraculously improved enough so that he no longer qualified, or so they said. That was a year ago and he remains stable. What I wanted to tell you was that we checked out our options for fighting Hospice or filing complaints and everyone said it would be pointless. They would receive a mild reprimand and that was all regardless of how incompetent they were.
Keep notes and records in case you decide to seek legal courses later. But now you need to heal. And this place seems to be where we both belong.