Hi Tris. Yes, how many years ago was it? And do you have spray finish or hand painted?
We had our kitchen installed a few years ago and, despite two boisterous kids and a dog, it still looks great but we had to touch up some chipped areas (we have a lot of very dark cupboards). We did it with the original paint though, not markets, as you would never get the colour and texture right with them. Also, our kitchen is hard wood and hand painted not MDF and spray painted which is also easier to fix and it ages differently. I know our friends with spray painted finish can't fix it as well. And yes, we gave them exactly the same feedback - why do they use white undercoat for dark cabinets...? Seems like a massive design flaw.
I don't understand the swelling doors though. This doesn't sound right at all. We have lots of floor to ceiling cupboards and wash our floors all the time, kids spill water, no swelling anywhere whatsoever. All wood needs to be painted with waterproof paint to avoid it.
Sorry about their aftersale care manner. Thankfully never had to deal with it. We absolutely love our kitchen and the fitting team were amazing but we found their sales team obnoxious.