This boy knows me as a preacher for years now. So, I thought of how I will take the same person who I have been preaching to and lock him up. How will the preaching continue when he is eventually out of the place I locked him up?

This part will make you bottle your anger for real. I think this is why he took you for granted because he knows you can't have anything against him because of your identity.

It's better to pay a particular percentage and pay fully after the job is done to satisfaction to prevent these kind of stories.