What to do when hospital releases patient before Medicare appeal has been decided?

Horrible experience with local hospital.. My Dad admitted on 1/23 for uncontrolled vomiting..they call on 1/25 & say he's being released. I go there to get him, they say he has to have ct scan before being released. They find tumor in colon and do emergent surgery..it's cancer.&He ends up with colostomy bag on 1/28. they try to release him on 1/31 but I don't feel he medically ready since goals were not met that were set by surgeon( solid foods & being able to walk around on his own after being bedfast) so I tell hospital staff I'm going to file Medicare appeal..which I did 2/1... hospital released him 2/3, without notifying us, even tho they knew I had filed appeal. I spoke w/ appeal person on 2/2 and she told me he'd stay in hospital until appeal decided on 2/5. I told 3 diff nurses that we were appealing. My Dad even tried to refuse discharge but they gave him 1 hr notice before shuttle from nursing home picked him up.