Recently I bought a Groupon, but I forgot to use a promo code. I asked if I could cancel and re-purchase because the difference was $80. I was told that wouldn't be equitable for Groupon. I've been a good customer for several years, and they wouldn't bend. They tried to get me to believe that the promo code wouldn't work for my deal, but I had referred someone who did get the 20% off his price. I pleaded as a matter of principle, but Groupon didn't care when I said I couldn't shop with them anymore. Nothing I said made any difference. Groupon would rather dump a customer than to make a good business decision. They finally offered me a measley $5, which to me was the same as leaving a bad tip at a restaurant. I no longer will be a Groupon shopper because I know that the customer DOESN't come first.