It sounds like you are doing all you can and have offered to try to help get things sorted. Instead of looking at this negatively, you can use this opportunity to become more friendly. After all, they have obviously not been unreasonable, nor have you so you know that they are probably nice people.
My ex husband once built a gigantic bonfire next to our boundary fence (despite my protestations) balanced a great fibreglass folding caravan on top, lit it using petrol and was then surprised when the fence caught fire. To start with he wouldn't let me call the fire service so he and his brother were running up and down the garden to with buckets of water which had no effect. When the fire service came out, along with all the neighbours who wanted to know what was happening, he yelled and swore at them to go build their own bonfire if they wanted to watch one. I was mortified but even more so when the neighbour came round and told us all their tools which were next to the fence, including the lawnmower and strimmer, had melted. They were good Christian people but it didn't stop them wanting their tools replaced within 24 hours
On the up side, I met my current husband (although I didn't know it at the time) who was one of the fire fighters!