I am so sorry you had a similar experience. I can’t imagine putting another person in that situation.
The only scenario I have had where I could have caused a problem for a neighbor is when a tree of mine decided to self prune and sent a large limb to the ground. First thing I did after making sure no one was hurt was to alert the closest neighbor who was not home so they could make plans to come home and investigate versus returning to a nasty surprise. Next thing I did was to ask permission to start clearing the tree at 6am so we could both be sure there was no damage to her home. She immediately agreed and I took action at 6am and cleared the majority of debris in one day. And, now I try to trim the tree at the first sign of too much growth.
Grateful that I have at least one good neighbor.
Jen
P.S. Sent another request to the neighbor that caused the sewer issues last night requesting that they have compassion. As you might have guessed, I received no response.