Today I checked my bank account to discover that Tippr had credited my account exactly when they said they would last week. From the day I sent my first (correctly addressed) email to the day my account was credited was only 5 days (though I did have to send a second email requesting my money back. They were originally going to give me credit as my order was over 30 days old). Despite the fact that I used one of the tickets, they refunded the entire amount AND posted a $5.00 credit in my Tippr account.
To start the refund process, email them at firstname.lastname@example.org. requesting a refund (to speed things up, include any voucher numbers or promo codes in your correspondence).