Child Custody Under Aduldtary

Dear Sir/Madam I would like to share that I am a married guy from last 7 years, and in relation with my wife from last 11 years. I was happily married since the day I caught my wife not once once but over couple of occasiaons of having involved over phone with one guy. The suspense got over when one day she was caught red handed speaking about love and faulty language with him, after the occassion the phone recordings showed they are been into relation for more than 2 months and have had more than 1200 calls during the tensure involving talks about sex as well. I think this would not be enough to prove adultery thus i took the case seriously and now have proofs of 3 incidents : 1. Travelling in joint sleeper bus from overnight and return 2. Staying in Hotel For overnight 3. Audio rerecords of both the persons to have kisses hugs etc, also both of them have agreed in front of me that yes they did these activities, recordings for the same is also available. So i just want to ask you learned people is this Info with Proof is sufficient to prove adultery in court. Secondly and most important I have a Kid of 3 years which she is taken to her parents place for over a month and inspite of my several request neither she is willing to come nor to give me my kid. Kindly suggest what actions can be taken, can i prove adultery and get my childs custody ??