We don't proactively cancel Yelp Deals vouchers or Gift Certificates that customers have purchased. Even if the customer is confused about the terms of the Deal or unable to redeem it themself, the customer may still want to give the voucher to a friend, for instance, rather than receive a refund.
Of course, if a customer attempts to redeem a Yelp Deals voucher out of accordance with its terms, you aren't obligated to honor that voucher. In those cases, you may instruct the customer to contact our support team for a refund.