If you get a decent refund to keep it, you could stabilise the surface with a foam safe adhesive, use a light weight filler like the spakel that the guys keep mentioning onthe forum.
Then sand it smooth, when you get it looking something like (no bubbles). You can use the acrylic filler, I just bought some (got it from scewfix £2.40 a tube), smooth it over the area you sanded, then when dry use a fine wet and dry to blend it in with the rest of the wing.
The last bits the hard bit, buy some red and white acrylic paint and try to match the shade of red (may need some orange or yellow too so it blends in perfectly.
Thats what I would do, but I would want a good refund off them.