KIA Motors

My husband brought my car in to have the back tail lights checked because it's constantely holding water. Water has been seeping in the lights for a long time. I brought it to KIA's attention when I first brought the vehicle and was told it would dry up. Well it has not and the lights still are foggy and holding water. I have an extended warranty on my 2015 Kia Optima but they said the tail lights are not covered. It would cost me over $800 to replace the gasket. This is a cost that is an expense I can't afford and should not pay for since there is a defect. I notice several other Kia vehicles have had a recall for this but not my model. I would like this resolved as soon as possible so that no rust or other issue occur due to this defect.