Not only that, but even the wall is over the boundary (based on where the face of the old fence came to, that is).
They have also knocked over the last pillar on my front garden wall (no consultation whatsoever).
Part of that foundation was built out as the wall was constructed, so from where the face of the fence was, they are over by quite a bit.
I know that boundaries are tricky to work out, but when I saw what was happening with the foundations, I talked to the neighbour and asked that the boundary and my wall be respected.
The neighbour has offered to pay for repairs to:
A fence panel they ripped (yes I mean ripped) out to get to the wall on my side
A plant that they cut out of the ground to get to the wall on my side
A new pillar/support for my wall
I'm still in shock, to be honest, but I wanted to ensure the wall wasn't likely to fall on anyone first and foremost.