Fitment center cracked my fog lights

My husband bought fog lights for me online and the covers didn't fit even though the ad said yaris 2008+. We drove to autostyle on Saturday to return them and they assisted with an exchange. My husband then asked them if they knew a good auto electrician and they referred us to their own fitment center. We waited for almost 3 hours as they fitted them. We went home and on Sunday we decided to wash the car. We immediately noticed that one of the lights started to mist up. We got home and my husband then removed the cover to have look and only to find out that the guy who was installing the fog light had cracked the back cover of the fog light and it was letting in air and water. I then came back on Monday and showed guys at the desk the pictures and they first denied it and then they decided to seal the light instead of replacing it. This was so unfair as I didn't break the light and I expected a replacement. I will never buy from this place again.