New Neighbor bought trashed house and knocked it down, now killed MY fence line bushes

Hey all this is a bit long but I gotta ask,

We bought our little dream home on the coast and its been great. Until the new neighbor started knocking down the crack house he bought and wants to rebuild. Which is great, BUT we have a row of hedges that are 6ft tall and have been there for 30 years and act as a natural fenceline. Well the guy comes over trying to sweet talk my wife to let him rip them out and plant something small and modern. My wife says no we like what's there and we are keeping them. Well he starts yelling and screaming at her and says that his wife want's them ripped out and her opinion is the only one that matters. And he stomps off. Well later on that day the excavator operator comes over to the hedge row and rips out one of the 8 bushes. My wife goes out and makes him stop. And he says he's just doing what he was told. So flash forward two hours and the owner of this barren lot calls my wife and gets belligerent with her again, so long story short he hangs up on my wife who was being very respectful and kept her cool. Then the next day a guy shows up in a beat up van with a bug sprayer and walks right over to the bushes and starts hosing them down with some chemical. My wife goes out and trys to get him to stop and the guy swears and grumbles and walks away after he's done. So we can only think he put killer all over them. She calls the owner and tells him what went on and he said Oh that must be my gardener I'll call him and talk to him. Mind you there is not ONE stitch of grass or bushes anywhere on this 1/10th of an acre. We never get a call back so we call a day later now he says his surveyor put in pins and its on his property, which were 99% sure it's not. So we ask for the surveyors number so we can call him and he says, I'll find out if he wants me to give out his number and of COURSE we get no response. We do have the "gardener" on camera spraying the solution. But I'm thinking I need to get my own survey done first off, but I did a background search on him and seems all he does is flip property like 20 in the past 8 years. What can I do to "Block" his view that he so wanted now that he killed our bushes. GRRRRRRRRRRRRR!!