I purchased a air vent cleaning for $49 dollars. I put it on a credit card. I called the merchant for an appointment. They never showed or called. I call Groupon after seeing that it had been refunded on my Groupon account. Groupon said my card was declined and they didn't charge my credit card for the service. I get my September credit card statement and a $49 Groupon charge for August 18 is listed. They don't acknowledge the charge and claimed they never charged my account. They refuse to give me a refund and offer me $49 in "Groupon Bucks" instead. I don't know what "card" they claim to use but it didn't exist. They charged my card and i have proof. My credit card company is fighting this. DON'T USE GROUPON! They are fraudulent and will take your money and hid being a bunch of lies! You've been warned.