Fog Light Switch problems of the 2010 GMC Acadia

A few months after purchasing a certified 2010 Acadia the passenger low beam would work intermittent. I took it to the dealer and was told it would cost me over $1000 for them to fix it even though it was still under warranty. I few months later the passenger side low beam started to do the same. I again took it to the dealer and was told it was not there problem and would fix it if I paid for the fix. Now neither low beam will work and I have to use the fog lights if I want to drive at night. The visibility is terrible and unsafe. This was an issue gm and the dealer knew before selling the vehicle to me.