i went to the store to buy something, when i showed them the coupon that I printed out from the merchant's web site. the cashier went around, asked two people, then told me that they can't accept it! Well, I wasn't using a fake coupon! So I went to Target and bought the same thing with the coupon with no question asked.
Then later, the manager called me, and told me that he apologized for that, etc. But he didn't offer me any compensations, I thought that I was going to get some freebies or something.
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