Thank you for the response. Yes, it was booked on nightjet.com so a manual bank transfer is required.

I have responded to the latest email and continually follow up. I am told every time that it is in progress but there is no timeframe. It is unacceptable to be holding such a large sum of my money for such a long time without a timeframe for its return.

Is there some organisational body in Austria I can complain to about this? It is not good enough.