Wife not accepting for mutual divorce

Dear Sir/madam. Iam asking this question on behalf of my freind. He was married on october 2017.Since then there were many clashes between the couple, the wife wants her husband to behave according to her thinking. She doesnot want to stay with inlaws, she want to stay away from them. Slowly she went to her parents house during aashada masam(traditional ritual where a girl should stay at her mothers home). At that wife asked husband to senf laptop with his brother. Husband said okay i will send but before that i need to format as it is working slow than before. While formatting the laptop there he saw some call recordings which wife had talked personally with someother guy(after officially engaged and marriage date is also fixed) Husband asked their family members regarding this, since then they files a DV case dowry case againt him. At last she withdrew the case and signed on a paper that they want to settle down outside the court and apply for mutual divorce. Since then she is giving trouble in giving the divorce. She is telling she want to come again to husband. My questions are: 1) will those call recordings work as a valid proof? 2)my friend doesnot want to stay with her any further because she ruined his reputation by making all flase allegations. She now mailing to my friend that she wouldnot have done this, sorry it is my fault and she had filed the false case by listening to her parents and etc. Would these mails work as a proof? 3)they are staying separately since 1year now. Would he get divorce if he apply for contestant divorce