There is the possibility of having the fees for the semester tickets (train, bus and culture) reimbursed under certain conditions. You can still use the tickets! Unfortunately, applications can only be approved until the pot is exhausted. Here you can find more information about the refund of the semester tickets in easy English. You need several forms that are currently available in German. You can find it here. If you have any further questions, you can write to the department of social affairs.