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@santino
I see what you mean, you can negotiate a new price and invest into a carbon repair kit (between £25 and £35). You will need to buy some clear varnish too. Laying carbon is fairly simple if you understand the constraints on your handlebars. It is the end where the brake is fitted so you know the force will be from the inside to the outside. Then one layer all the way around overlapping itself should do the trick. On top of that, you have a bending/flexure constraint coming from your weight holding the handlebars. So i would lay down with an angle some long (but not large) strip from the body of the handlebar all the way to the end (brake side). You probably should cross those layers to improve rigidity. That would create a new very robust structure. Probably overkill but at least you would be 100% safe, we are not talking of optimizing the critical point of the handlebars but reducing weight here.
You can then saw/paper sand the excess at the end to fit your brake (remember to wear a mask, very toxic stuff) to get something clean. One or 2 layers of varnish and you are done but keep in mind you probably will end up with a slightly wider outside bar than the other side (carbon layer are very thin, probably not by much).
I designed and repaired many carbon components, very easy to do once you get use to the way it behave when soaked with epoxy.
But i still would give it back and hunt for another one, not worse the hassle except if you want to have the pleasure to do it yourself.