Spilsbury

First I ordered 3 puzzles. They charged me $10 for shipping all 3. Then a week later, I see my credit card has been billed a different amount. I went back to my order and saw that one puzzle was backordered. I called their customer service line. They said I would receive the 3rd puzzle when it was available, and I would not be charged shipping on it. A few days later I received an email stating that the puzzle was never going to be available, so it was cancelled. 2 weeks later, still no puzzles. When I called them, they said my puzzles were sent to someone else by mistake. Due to high demand they said they could not replace my puzzles. So after about 4 weeks, they tell me no puzzles are coming my way. They said they had reimbursed my card. Case closed? Nope! They shorted my credit card reimbursement. When I asked about this, they said it was an 'error' and that they were sending me a check for the balance, along with a discount coupon for my future purchases. Anyone care to guess what I did with the coupon?