A letter is always better than a phone call. People write things in letters they would never say in person. They permit themselves to write down feelings and observations using emotional syntax far more intimate and powerful than speech will allow.
Going back to school is like going back in time. Immediately, for better or for worse, you must give up a little piece of your autonomy in order to become part of the group. And every group, of course, has its hierarchies and rules- spoken and unspoken. It is like learning to live once again in a family- which, of course, is the setting where all learning begins.