In reply to florence58: Holes in my tent have been held shut with duck tape through many weeks of camping in all conditions. If you put it on carefully and on both sides of the damaged area, it should last just as long as your tent will.
I doubt you will find anywhere that can actually replace that panel for an amount of money that will make it worthwhile.
So if you don't like the ducktape idea I would go with a new tent or an attempt to get it replaced under warranty.