They know I am unable to sue them as they are in Greece and I am in the USA and it would be incredibly expensive to take legal action against them.

Look for signs of erosion and talk to neighbours who have been there for a while (10+ years) to see if there have been any problems with flooding or erosion. 

It could be a grumpy neighbour depending on what the complaint was about.

It has such a great track record to date doing that, after all.And Greece should have its debt forgiven by Germany because it's the right thing to do after ten years of forced austerity driving the suicide rate up, sending a whole generation to work abroad, destroying the very fabric of Greek culture!

It turns out my electric bill and feed is also my upstairs neighbours, so the bill is for both my flat AND his flat, but is all on one bill (in my name only) After speaking with my upstairs neighbour he informed me that he pays the landlord rent with money for bills and has done this since he lived there.

I know someone whose neighbour's tree fell on their car. 

I hail from just outside Vancouver so we are kind of neighbours.

@Daniel Hess Communicate with that neighbour first to know exactly what's wrong. 

I can also personally verify that in 2007, the Finance Minister of Greece...damn, he always sounded like he knew what he was talking about when it came to high finance.

They were supposed to be sold Bonds which were issued by AA+ rated banks, but they lost vale become they had exposure to the crises in Europe, about 5 years ago, mainly because they had exposure to Greece.