What was rajam's plan to take revenge of the coachman son?

Rajam hatches a plan to get his friend’s money back by kidnapping the coachman’s son, which they rope Mani to help enforce, but Swami begins to have misgivings. He lies that the coachman’s son has returned the money and then pleads with Mani to not go through with the plan out of fear of how the coachman’s son might react, but they follow through with the plan. Swami follows Mani to the coachman’s house, and they get into a fight, with Mani attempting to strangle Swami, who starts to cry. A crowd assembles around them, and then the coachman’s son emerges. Mani tries to get him to follow them by promising him a top, but the boy hoodwinks them, taking the top and disappearing into the house. They knock on the house and a surly man appears and says that the boy is not there. The neighbors begin throwing stones at the two boys due to the disturbance that they’re causing and they run away.