How will i plug a neighbour’s leak into my flat?

Every week a Guardian Money reader submits a question, and it’s also up to you to aid them out C a wide range of the most effective answers can be in Saturday’s paper.

This week’s question

I reside in a flat and twice up to now year For a nice and badly flooded by way of leak from my upstairs neighbour’s model. When I’ve were required to pay for the excess, and endure lengthy repairs. As soon as i complain he just fobs me off. How does someone stop it happening again?

What would be the thoughts?