If you actually took a train in the last 3 years you would know that the process is know online via the App/Website, and everything is already filled out for you

Sure. And then a few weeks later they send you a letter, asking all the information again which you have to send by mail.

Source: my train back from Amsterdam was late...

My refund from my cross-border journey this Sunday was issued yesterday.

But that was from Germany to Austria, so that might make a difference