You have not given much detail about the relationship between the husband and wife, how long they have been married, any issues of marriage, whether they are Hindus married under HMA or Muslim or christian etc. The marriage relationship has to be considered in all aspects before deciding on the suitable remedies, and it is not wise to give any advice based on a singlre incident. There can be many ways of tackling the situation.
Regarding NGO's, you will have to look carefully before deciding on one, as often it is found that many so called NGO's are in the game of publicity, and become active only after intervention of media, or in cases where big names are involved, whereas they don;t show much enthusiasm when it is the case of an ordinary person.
Best of luck.