I used to deal with this when I finished uni, so the below is probably not quite state of the art but most of it will still stand.
It can regenerate from astonishingly small pieces, 1cm cube if I recall correctly. I once visited a building site where they’d put it through the woodchipper…
It will grow back through tarmac and even concrete on occasion.
As others have said, repeated glyphosate treatment will kill it. The only other real option is to dig the lot out, pay for it to be tipped and the backfill with fresh soil. That’s often the preferred method for building sites where total removal quickly is key, but obviously it isn’t cheap!
You also seriously need to get your neighbours to sort it. I can’t remember precisely but the rhizome network can spread metres so it could easily reappear of the neighbour doesn’t sort it. You can dig a trench and lay a geotextile membrane to stop the rhizomes spreading, but the kosher stuff was around 400 quid a roll.