[BK911]

So dementia mom lives with me.
She got pneumonia a while back and fell, and had to be admitted into a rehab facility.
After a few weeks the facility called and said rehab was over and we would have to start paying for long term care, or appeal the decision.
During the appeal the care would stay as was.
I didn't want my mom there and went to pick her up.
They would not release her to us for some unknown reason.
So I filed an appeal while waiting for her release.
This was on a Thurs and we didn't get the rejection notice until Monday.
We called the center and told them we were coming to get my mom.
All went well until I got a bill for over $3k.
I am trying to appeal but insurance said they were never billed, and the center is not budging.

What are my options?