My experience is not that they have zero comprehension of customer service, it can be patchy though. Nowadays I excuse all because they are so cheap and so for those prices something has to give.
The bearings in some of their wheels are awful and don’t last long but are easy and cheap enough to change for better ones as and when.
They forgot to send my 456evo2 out until I chased a couple years ago but I excuse all that because it’s my favourite hardtail to date and that’s before considering it was just £150!
Three pairs of neoprene overshoes for £15 on the same order as the frame are still hanging in there too.