I recently had my car serviced and i had asked the dealers to look at a fog light (passenger side) on my car as is frosted up due to water getting in somewhere. I have checked the front of the fog light lense and there doesnt same to be a crack in it. I asked the dealers to fix this under warranty and they are saying that it not covered under warrantly as it has happened while i have been driving the car and i stone has cracked the lense. What should i do as im sure it isnt cracked, it must be letting water in somewhere from the bakc of light?