Jay,
maybe try phoning them. Not all companies, even good ones reply to e-mails with any reliability. I've run into a few. Usually a tel call will at least get a good contact who will give you their e-mail address and then you can deal reliably with them. Once you have that contact all changes for the better, usually.
If the area is small enough try doing what I did. I did just have one small break about 3" across. Filled it with matte and cloth for build up and then for the gel coat i made a pattern/mold.
Used some liquid latex rubber to copy the pattern itself.
I cleaned an area close by and then laid down some of the liquid mold release wax, enough to ensure my pattern wouldn't stick but thin enough to NOT fill the pattern too much. I then applied several layers of the latex so it completely covered the pattern I had cleaned to copy.
Then I used a piece of coarse cloth and pressed it on and more latex over the cloth to reinforce, forcing the latex through the cloth. Then on top of that I latexed a piece of plywood. If the deck is curved, likely, you will have to build up the latex and rags so the backing ply can adhere. Mine is curved but the area was small enough I could ignore it.
I then, once my mold was made, laid it over the area to be patched and wiggled and fiddled untill it felt like it was falling into the existing pattern. Then using tape I made registration marks to there would be minimal fiddling once the gel coat was laid down. The whole mold does need to be omewhat larger than the patch area, 1 to 2" all the way around.
Applied some more wax, lightly, to the mold face. Laid down the new gelcoat, pushed the mold into place and put a weight on top.
It turned out pretty good for a hack. I should have used a much heavier weight as the gel coat was more viscous than I thought so there is a slight height difference between the patch and the original deck. The gelcoat, I could not match the colour so there is a difference. Yet, it looks pretty good and unless pointed out now does not stand out and looks far better than the broken spot.
Thank you all for the links also.