Places that do glass repair for motor boats should be able to manage a kayak if it requires extensive work.
But - if you post a good description of the damage and photos here - there is a good chance that you could get pointed to instructions for how to do it yourself. If it went beyond the gel coat it is still quite doable, just requires more steps, materials and time. I have paddled with many people showing patches all over the bottom of their kayak and the boats seem to work fine.
If it is only gel coat damage, it is just some goop and the patience spend the time sanding well. How nicely the final sanding needs to be done depends only on your tolerance for solid but aesthetically imperfect repair jobs. As my boats attest, my tolerance for aesthetic imperfection is quite high. :-)
Overstock Outlet Foods
Pull-Up Strap Handle Kit
URCHIN Portable Anchor
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