Busted my neighbor shoveling his snow purposely throwing it over the fence into my yard.

I looked out the window and this man is shoveling his driveway in his backyard and purposely is lifting the shovel up to dump the snow into my yard. He only stopped because he saw me looking. In the summer he would rinse out his trashcans and dump the water over my plants. Rude people. Never did anything to them and I've lived here far longer than them. They've been here for 2 years now and me over 20. Older couple in their 50s.