I doubt that complaining will change a rule put in place to prevent them from being swindled by an error. It's an accident that while it would have been nice to take advantage of, you cannot be mad at the company for not giving away products at under 1/10 of the normal price and in the process losing tons of money regardless of how large a chain they are. They will refund eventually but it will probably take them time to sort through it all.
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