False Dowry Case threatening what to do

Dear Sir, I am Ankit get married with a woman who is highly spiritual. She is doing her PhD in Shantikunj Haridwar. After marriage she stayed with me for two months and then she left for her house. She did not come back. We requested to her father multiple times and ask the reason of not coming. We also have audio recording of the same. She is not with me for last seven months all the efforts were made to bring her back but could not succeed. Now they are asking 40 lacs rupees for the divorce otherwise they will go to court (I have Audio Recording too). During marriage also they conveyed wrong information like, they wrote three years less date of birth and they Dr. on wedding card infact she was pursuing the phd etc...please advice ...