They should fix stuff for free. I think with that kitchen socket thing, it was more of a design problem than faulty workmanship if that makes sense. they just fitted them is a stupid place.
I think you will have to be fairly stong with them, as if they can get out of anything I guess they will.
The good thing is, with a number of apartments left for sale, I would have thought they will be looking to keep those that have purchased as happy as possible.