Since the dealer was so pro-active in telling you about it I would give them a chance to repair it. If the result doesn't look good then as for a new wheel.
The only thing about the damage the is worrisome is that it appears there was a chunk taken out of the rim of the wheel. From the picture, you can't tell if the damage is just cosmetic or structural.
A big enough chunk out of the rim may weaken the wheel and there may be a crack hidden from view.
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