Wow, 9 months is extremely long.
When exactly did you request asylum?
Odai, you should really contact a lawyer. It might help to initiate an "Untätigkeitsklage", a way to force the administration to act on your case.
Maybe Caritas, a NGO, can help.
Here is the link to their department in Trier.
This is a link to the law, unfortunately in German, that will apply to your case.
I really hope you can get the process moving again. 9 Months is way longer than it should to grand you your interview.