Well, Apple engineers engineered the new macbook airs and long story short some people got fired and the power pads just don't work with the airs. Apple really should help you because it's been less than a year. I would try and find an Apple Authorized Service Provider because they are a lot more reasonable and like mayer said, they have ways to hold apple's feet to the fire. If you just want to do it yourself, replace the topcase because I work with macbook airs at the school I work at. Every student has one. Our fix is to replace part until it works and it's all under warranty because Apple screwed up the power pads.
sorry
-Adam Kruszka