Yikes
You can try to put the USB back in the neck, but from the picture it looks like it's snapped at a hardware point. If it was roughly handled, there isn't much you can do, but if it broke from being a poorly made product, i'd take it back to wherever you got it from and explain what happened. From what i've learned, I would never buy an iphone 5 charger that isn't Apple approved. Check the packaging before you buy.