My neighbour used a hammer drill to fit one end for his line post on my garage wall. The garage wall runs parallel with the boundary but is set a few centimetres back and so it is all on my property. I do not want this on my garage as it may harm the brickwork with the weight of his washing, also the fact that he took out a line post from his garden when he first moved in. He did not ask my permission and has refused to remove it. What is my best course of action.