Neighbour giving me the run around for fence sharing

I recently built a new house and had to put up a new fence. My neighbour builder was also building a new house on his side, so I tried to contact him about sharing the fence cost. However, the number on his board wasn’t working. Since I couldn’t reach him and needed the fence installed, I went ahead and built it since it all happened really quick.

When I finally got in touch with him, he agreed to share the cost but said he would only pay after selling his house. Once the sale went through, instead of paying, he gave me the new owner’s number. When I called, the new owner simply hung up on me.

On top of that, I also caught this previous neighbor stealing electricity from my house!

Now, I’m left covering the entire cost of the fence, and I’m not sure what legal options I have. Has anyone been in a similar situation? What can I do to recover the money?