opinions?

so the last week or 2 the kitchen ceiling has been dripping. i finally get up to look at the roof and what do i find? well the neighbors resided their house, and without asking me, did the side of my house that faces theirs. i am fine if they want to do it for free. but they never did ask me or say one word to me about it and... whoever did it, did a piss poor job of it... especially when you look at the pictures and see how well they finished it.

notice the light blue of my siding and the grey of the new stuff. its great when you can see through the hole in your house to the plywood thats holding the shingles on. and the spot where someone snipped of the flashing that used to be covered with roof tar to make a nice waterproof seal all gone...

so where do i go from here? homeowners ins? lawyer? a contractor to get an estimate?

i believe the siding was done within the past month, but i can be sure. it's not often i go out on the roof just to look at stuff...