[jonas-w]

Currently the best way is via fax or post

[wongarsu]

*most convenient. The best option is obviously coming in person, with a ring binder containing all relevant documents as well as written records of all previous communication

[LeonidasXIV]

Be sure to queue up 2h before opening time of the office you want to visit because everyone else is also dropping by in person too and the office closes for public service at 12:00.

[oaiey]

And not to forget: in German :)