Bumper problems of the 2005 Kia Motor Spectra

I own a Spectra 5. I am very happy with the car in most every aspect, but the front spoiler is not secured to the car properly. I tapped it on a parking curb once, and now it's completely falling off. My kia dealer couldn't fix it and said I needed to go to the body shop. I went to a kia body shop and they told me that it would be more than $700 to fix and there was no guarantee that the next time it caught on a parking curb or low dip in the road it wouldn't fall off again. I am not prepared to pay $700 to repair something that was designed to be that low to the ground but is not be able to handle some minor impact as it was bound to experience. Almost all roads have some defects that would cause this spoiler to hit the ground and many car parks have speed bumps and entrances to driveways have dips that this will most certainly catch on again. I am going to have to remove from the car until kia can make sturdy enough to handle normal use.