that sucks. code trades should be done immediately since its just a PM. That said, i would give him 24 hours or maybe the mods can put a 'under investigation- do not trade' tag on him before the ban, to encourage that you get your end of the deal.
I gave him a negative feedback I didn't want to but everytime I saw him came on and didn't pm me or sent the code I left a negative feedback maybe when he see the negative he will pm me back