My neighbour constructed a wall over the boundary wall constructed by me without consulting with me. I stay in another village and this property is 15kms away from home. They had raised their land by filing it up and now my plot is lower than theirs. The exposed side of the boundary wall in my plot was covered with waste which includes cement, pieces of tiles, saw dust etc. They made it look like a support for the boundary wall, so that it does not fall into my plot. I got some people to remove it, it was stuck very strongly and was difficult to remove, When we removed the waste along the boundary wall, we found that they have kept a drain pipe into my plot.
Is this allowed to drain surface water into another persons plot? Can I go against them legally for doing this? I am having lots of trouble with this neighbour. How to proceed?