My wife purchased vouchers for kayaking in Brisbane as a family activity on my birthday. She booked via Groupon’s online booking tool and received a confirmation email.
When we arrived the staff could not find our booking and as the session was fully booked we were turned away. We then had hours to kill before our dinner reservations.
Groupon = ruined birthday
We immediately contacted Groupon to ask for a refund as my birthday had passed. They tried all the dirty tricks (changing agents in the middle of online chat; failing to meet any of their own deadlines; and offering us a credit on their UK website - I have copies of all their emails to prove these allegations) to avoid giving a refund.
To be fair I must say that the staff at River Life were amazing in helping us secure a refund from Groupon.
After five long weeks of broken promises and terrible customer service, we finally received a refund - but not before they offered credit on their Groupon UK website!

Approximate cost: $220