Nri divorce

Dear Team My family and I are NRI residing in South Africa. I'm writing this letter regarding my son who got court married in India (Pune) on November 2015 and in February 2016 according to Islamic law(Muslim nikka). His wife got her immigration paper in March 2016 when she joined him in South Africa thereafter started creating endless problem and refuse to stay in South Africa. Her family forced us to send her back to India and promised to send her back to South Africa within one month. We eventually had to agree to send her to India in May 2016. Since she had left in May 2016 we had to negotiated with her family to send her back to South Africa, however we didn't succeed for 8 months and it was mutually decided by both the families that it's best to get a divorce. We had sent the Islamic divorce in January 2017 in a mutual consent whereby it was also agreed that there would have a legal divorce as well. Unfortunately after his wife received the Islamic divorce they decided not to go ahead with the legal divorce proceedings. May you kindly advise on what are my options available for my son to get a legal divorce settlement from India? Regards, Farook