Refund for unwanted voucher

I bought a Groupon voucher for a deal that I thought was value for money. Only after trying to use the voucher or the merchant's website did I realize that the deal was really not worth it and that I had to pay a ridiculous amount of postage for the product. I emailed Groupon and requested that my voucher be cancelled and my money refunded. Happy to say that they did exactly that! :) I'm very please with the customer support that I received.