Its petty, and I know it, but all the same:
Estate Agents of Procrastinatory Doom failed to turn up to our final inspection with the right forms for us to get our bond back... or answer any of my several phone calls... or even find someone who could talk to me when we turned up in person on their doorstep. I thought they might be gearing up to try to keep our bond.
But I found a website which mentions the little-known rule that I can file to get all of it back without their signature, at which point they are given notice and have two weeks to file their own claim. Mostly, I just did it so they'd at least answer my calls.
They never responded; we got it back today. All of it.
For once, the fact that these guys never respond to anything worked in our favour!