Of course the company should replace or repair it, but I remember seeing that website before, and being immediately suspicious because of the continued use of "ukulele's" instead of "ukuleles". Even on their logo at the top of pages, and throughout the site. Doesn't inspire confidence.
If you're adventurous and have some basic tools and skills, you could try straightening the neck. I have a koa uke from Vietnam that twisted the neck shortly after I got it, and rather than assign it as a wall-hanger, I rigged some clamps on a table top that would try to force the neck in the desired direction. Then I used a heat gun, and some trial and re-doing, until I got it straight enough to play well (after untwisting, there was a high area in the middle, which was easy to force the same way with clamps and heat. You apply the pressure, heat it evenly along the neck (hair dryer may work, I used a heat gun...carefully!!), and let it cool, then check it and repeat until it is good. It may also be necessary to check and level the frets, and there are some good online YouTube tutorials of how to do that without breaking the bank.
Of course it may not work, but it's a moderate-priced uke, and if you have no manufacturer taking responsibility for it, it's certainly worth a try if you have little to lose except a wall-hanger. The one I did has remained OK for several months now, so I suspect it may stay usable. The twist was pretty severe to begin with, and it was unplayable unless you didn't mind a LOT of string to fret clearance on one side, and the resulting bad intonation.