Pottery Barn review: Lamp shade that discolors ofter around one year

I bought 2 Maddox Terracota lamps, the extra large size with the white shade.
After less than one year, the lamp shade started to get the streaks of yellow on both shades. The light bub was the LED so not hot at all and the lamps were not in the sun. I called customer service and they did replace the shades. Now one year later the shades are doing the same thing. AS one of the sales persons in the store said, it looks like someone peed on it. Gross.
It looks like the glue that they used on the shade turns yellow with time.
Since it was one month past the one year return policy, they will not return them. It is the worst customer service around. The salesperson sympathized with me and agreed that it was a defective product, but his hands were tied at the customer service level. Just awful that they don't stand by their products. I can send photos but they are on my phone and I don't know how to transfer them
Diana Potts