Letting Agent is a bit out of touch if she thinks dog poo in your garden is a matter for Police. You have three choices. Speak to your neighbour and as the note hasn't worked not a choice I would now take. Put up a reed screen as another poster has suggested. Plant Leylandi , it will grow swiftly. There is another choice and that is move before you get completely stressed. You won't change these people.
Good Morning Saturday 20th April 2024