maybe also ask them to re-carpet, change the roof tile, update the kitchen and bathroom for you. see what he say.
maybe he will do all that for free for you : )
it's just part of package you bought initially but you may not even realised ! :)
I guess you will never find out the true story.
but from your side there is nothing need to be worry as far as I concern.
you got the house the title is under your name.
maybe the neigbour just have domestic issue ( marriage break up, they need money......)
so don't worry too much