I've applied to a graduate program at a university in Germany and there is relatively clear evidence indicating that they've missed one or even two of my documents in application review based on the responses they've given me. Now they are reluctant to reconsidering my application when I resent the documents to them and explained how those documents mean the reason they mentioned for rejection is clearly not true. This is not a subjective thing and it's completely objective and bureaucratic.
It's stated on my rejection letter that I could appeal the decision at the court and I have their emails where they explained reasons that are in contradiction with each other about those documents, which could help me make the case. I really like that department and want to have the option to go there later in my academic career, but I'm afraid if I take my complaint to the court, the department may develop some level of animosity towards me.
Do you think I should forget about working in that department if I start an appeal process at the court, or could I assume that everyone could just be adults and behave professionally?
Note that while I asked previously about what possible decisions to take, this is just about the consequences of an appeal at court when it comes to working with the department in the future.