Neighbor Issues

I am facing two issues with the neighbor who built a three story building in 30x40 plot with out any parking or setback. 1: He is making his tenants park in front of my gate and picking fights whenever I want to use the gate. Mine is vacant land for now and I have one of the gates towards the road of my neighbor 2. His tenants are constantly drying clothes and heavy items on my fence and irrespective of my requests many times he/she keeps on repeating the same recently they have placed a heavy iron gate-like object along with metal sheets leaning on my fence and it is making the fence bending. They are doing this intentionally to irritate us and pick a fight. they are the only house on the road. the other house on the same street faces the opposite direction and this person has the intention to occupy the road and build a parking shed since he didn't provide parking in the house not even for a small scooter. what is the best way to approach this? Talking to them is useless due to their ill intention to occupy the public road