"Lack of communication from Doctor"

My Father received a phone call from a Doctor who was concerned about my mother's condition during her admission on the coronary care unit.

This was a lot of information to take in especially over a phone call.

After having some time to process this information over the weekend we came up with some questions. 

My father has left a number of messages for the Doctor to contact him and so far this has not happened.

5 days later my mother was discharged still with no questions answered. I understand Doctors are busy. Although it would mean a lot if just some time and care was taken to answer the questions especially after receiving news that have caused us a family concern and worry.