Can I get wtsp record of any number legally?

Sir I was being fooled by two of my known person since past two years. One of which is a married man having two kids. Another one is a lady who was already involved in prostitution and muder case. They came in touch by my mistake. I gave his no to her for some work. Since then they started chatting calling to each other. When I came to know both blame me and told isn't not true. They just messaged each other few days. But after one year his wife told me that she is still in touch with her husband. I wanted to stop him. As we were very good family frnds. But he abused me told i m having cheap mentality he is very honest and loyal frnd. That also told me that she is very innocent I m only creating issue. But still whenever I see them both are online at same time. And after this misunderstanding I was getting annoying messages and call from unknown number. Both deny to have any relevance with any number. Can I get their wtsp record legally to proof that he is having relationship with a prostitute? If yes how ? because of this issue my relationship with his family also getting spoiled. N I'm also feeling hurt n cheated Thanks