sorry to hear this. kwik crap should have an account with a local refurb co, as I guess this happens all the time, theres no way they will pay for a new wheel and as others have pointed out a new one will come diamond cut and not painted and therefore not match the rest of the wheels anyway!
kick up a stink, if you aren't used to complaining just remember to try not to raise your voice and dont swear (I know its hard not to), just be really insistant.
I would say, if the mark was there before I brought the car in, why would I be stupid enough to waste my time and energy complaining? If it was there beforehand, any reputatable company would of pointed it out and noted it on the paperwork to prevent comebacks!
good luck.