Request for guidance on access for fiber cable installation

My house is located in an area surrounded by other private properties. When my grandfather purchased the house and land, it had a direct access path from the main road. At that time, the owner of the neighboring property permitted us to use the pathway for walking. Later, around one or two years after purchase, the same owner also allowed us to install an electric post along the pathway, through which we were able to get an electricity connection to our house. Currently, I am trying to obtain a BSNL fiber connection, which is very important as my work is IT-related. The road is only about 50 meters away from my house, and the fiber cable could easily be routed through the existing post. However, whenever workers attempt to install the cable, the neighbor objects and threatens to involve the police, even warning the workers that they may be jailed. The workers have confirmed this intimidation. I have already discussed this matter with local parties, community members, and even approached the local police, but there has been no resolution so far. I am now seeking your guidance on how to proceed further, as this situation is affecting my ability to work. Kindly advise me on the legal or practical steps I can take to resolve this issue.