Sounds like it's time to find a different dealer, definitely chase this up with corporate, this is unacceptable.Update on this: Cylinder 6 blew a plug now, so the blown plug "followed" the coil. My local Kia dealership still refuses to replace the coil, argued with the service manager for awhile. He claims if they don't have a code and if the coil "tests fine" Kia Motors America won't allow them to replace it. Seems like nonsense to me, so now have to go back and complain to corporate. Not sure if its the Dealership or Kia Motors dropping the ball here but its a bit ridiculous.
At this point planning on just fighting for them to reimburse the cost of me replacing the coil as continuing to leave my car for days at the dealership so they can do a 5 minute spark plug replacement is pointless.