My brother sold our shared Mumbai flat without telling me, what can I do?

I just found out that my brother sold our flat in Mumbai that we inherited from our parents. He didn't even inform me or seek my consent. I'm devastated and don't know what to do. This happened last week, and I've already confronted him, but he's not replying to my calls now. Can I file a case to reclaim my share? What are my rights in this situation? I really need some guidance.