Question

Even after the prohibition of child act child marriages are still going on here and there suggest some measures to stop this dogma

Answer 1

To stop the child marriage girls should be educated and should be taught that they are not allowed to marry at such an early age, with children parents should also be educated that they should not get their children married before a certain age. 
Other than that serious actions should be taken against the people who support the idea of child marriage and they should be penalized for carrying out such acts.
There should be groups of people who are against child marriages, they should get together and should spread a word that it is unlawful for a child to get married, they can make NGO's to support this idea.