dispute with the neighbour over boundary wall

We have built an independent boundary wall around our house . My neighbour has filled in morrum in the gap in between the boundary wall and also the drainage water of kitchen and bathroom keeps on seeping into my boundary wall. We have told this problem to our neighbour but he dosenot listens instead he abuses a lot. I can't let my boundary wall collapse because of recklessness of my neighbour.i want a legal solution of my problem. Kindly advice what type of case can I file against my neighbour and how can I save my wall. Everyday we have argument or verbal spat over boundary wall. Their tenants use our boundary wall to dry their clothes and keep their cycles by taking support of the wall. I have told them clearly not to do so still they do not listen and keep their cycle against the wall. I can't tolerate abuses everyday.please help.