We placed a case for divorce but now they are demanding money for that

Hello sir i was married 3 years ago in 2016 december. My wife is mentally retarded. When she get hyper we came to know about her mental illnes. My parents call her parents, her parents came to my home and took away their daughter by accepting it that she is mentally ill. And they said that they will favor mutual divorce. But they done nothing. This year in Feb i filed a case for divorce. In April it was first hearing and we both appear in front of judge and we both accept for divorce. Last month there was second hearing but they didn't appear yesterday was third hearing and they where absent again. I need help guide me sir what should i do? Give me some advice