what can i do?

I work abroad in Australia I’m here on a work visa, and while I’ve been away to provide for my family I got told by my family that my wife cheated on me & had been spending the money I had been sending to her for our family on alcohol so I confronted her via video call about it she denied all of it but ended up confessing that she was 7 months. 2 weeks after telling me she was supposedly 7 months my wife gave birth to the baby, while she was pregnant she was constantly accusing me of cheating when I have done nothing but stay devoted to my family. now she won’t let me talk to my children i can’t casually leave my job to come home & sort this all out so PLEASE help me i don’t know what to do