How to restrict a neighbor who has been encroaching for several years

We have independent galts n we reside on first floor. We are asking our neighbor who is residing in on the ground floor to remove the water tank top which he has put on the edge of our wall(bathroom and bedroom wall) since few years. This has resulted in damaging our wall as its dampened and withered.And the floor is weakening as he has put angle irons in our edge bearing the weight of the tank. We have requested him a no of times to lower the height of tank to his floor(just below our edge but he is not agreeing. I what should we do. We own the first floorflat n he owns the grouund floor flat. We both are Hindus. Can you guide me if we can make him remove the tank by approaching the MC or some authority?