Reviewers may have received a benefit, like a sweepstakes entry or rewards program points, in exchange for writing a review.
Those benefits were not conditioned on the positive or negative content of the review.
Hahahahaha. I doubt you would be able to get a refund. I would recommend that you return them and rebuy it at the discounted price of you haven't used them yet. But I might be mistaken. Send the receipt to the shop and see if they would gladly do it for you