Hello!
Thank you for your question! To answer your question well, a lot more info is needed. I would really recommend for you to go to a leagal counselling and ask for advice of a lawyer. We are not trained well enough in these topics. Since I don't know which city you are in I can only recommend Places in Berlin.
For Example here you could find answers to your questions
https://kub-berlin.org/
or here ****://***.bridge-bleiberecht.de/
Maybe you can also call to ask your questions if you are not located in Berlin.
I wish you good luck. If we can help with any further questions, feel free to ask!
All the best,
BildungsberaterIn