I’m so sorry you’re dealing with this. One thing I would strongly suggest is look for the patient advocacy/advocate for the organization handling your dad’s care. They helped me in one case with my wife’s care, which unfortunately was beset with incompetence and indifference from the start.
Memorial Sloan Kettering is widely considered one of the best treatment centers for gynecological cancers, and they were completely useless for us. The Dr. spent about 15 minutes talking to us and reviewing the case, gave no advice, said nothing in favor of or against the current plan and just said to reach back out after the current treatment plan played out.
This was six years ago and I still can’t think about it much without raising my blood pressure.
Anyway, patient advocate and phone calls/office visits are about the only tools you have. It can be a full time job keeping things on track.