It appears they have a different ICCU failure to the Ioniq 5. Instead of a complete collapse it severely limits charge rates when it feels pushed. There’s evidence that capping your charger to 6.6v will avoid the issue.
Arnold Clarke denying a rejection is concerning but these big groups do work differently. I’d be going to the group and KIA to reject the car.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark