Any sail maker can fix your kite. Moti Levy does good work but you have to post it to him in Ballina
www.kiterepair.com.au/You could easily repair a rip like that yourself. Buy a roll of spinaker repair tape. Clean the fabric.
Cut some tape for patches. Round the ends so there are no sharp corners to peel off.
I would use black tape and maybe cut the patch so it looks like part of the design. Trying to match colours is too hard and usually looks crap.
You could make the inner patch smaller than the outer patch so you don't get the edges lining up and making a hard edge.
Press it down well. You could heat it with a hair dryer to get the glue to set better.
You could sew around the edges with a sewing machine and some polyester thread. It's not really necessary.