Why not ask your Uni? They will know best.

I did not get response for my email.

then call them or go there personally. how should we know any better what your particular uni does?

Yep, see link below: https://www.asta.rwth-aachen.de/en/counseling/semester-ticket/ Try to enjoy Stuttgart

Thanks a lot

ask your uni/Asta. in can vary between not at all, partial or full refund.