I understand your disappointment however repeat failure of certain auto parts is a somewhat common problem in the auto industry.
After all these years they still have not returned your call? The service department won’t order replacement parts before inspecting the vehicle, you needed to take the vehicle to the dealer’s service department to have that repaired. If you buy a $100,000 vehicle one day you might get valet service for your warranty repairs but for now you own a Kia.
The normal charge for a valued customer would be .3 to .5 hours of labor, for a dealer to charge one hour or more to replace a sun visor would suggest that they are reluctant to do business with you, did you express how much you dislike their product?