The replacements are only for a couple of broken parts. If I got them to send replacements for these parts it would be easier for them to send me an entire new kit!
On further analysis I don't think it is a warping issue. It seems like the moulds are just plain incorrect, perhaps to do with the pour sprues. See the picture:
This is the back of one of the four quadrants connected to a pier (pier on the left). This will butt up to an identically assembled pier-quadrant pair, and the same another two times to make up the bulk of the model.
See on the left side of the pier the step along the bottom of the side? See how the quadrant has a similar mating groove where it meets the left side of the pier? Well the side of the quadrant facing the camera doesn't really have such a groove. It has a slight indentation, but nothing even close to what is required. I can get the pieces to align, but that means twisting things so that all four assemblies then won't work together.
I'm getting angry talking about it so I'll stop now.
Oh yeah I can make that....