Required information: Germany, maths, and undergraduate
Situation: In order to finish my undergraduate degree, I have to do one final oral exam with two professors (A & B). However, A and B refuse to communicate directly with each other and use me to communicate. The first exam was "postponed" indefinitely due to pandemic and now I have to organize a new one.
Problem: Professor A is very odd. He does not use email. He does not answer his phone (I was told to call him by the exam office and professor B) and now with only online learning, I had to communicate with A using text messages.
I asked him for available exam dates and he replied with a "yes" and nothing else. He then ignored my other messages. The examination office said if both A and B agree, I can do each part separately. Of course the B replied immediately with a yes. A did not reply at all.
Should I try to reach out to other professors or the dean? I have to do this exam to graduate so I can start my graduate studies, but I do not want escalate the situation.