I could think of much worse... amputation, followed by cauterization, and while they watch their lost appendages cook in the oven until the bones are brittle, let them taste the disintegration involved when 12 M HCl is applied to the stumps they still retain feeling in. Then, if they're still conscious, let them watch as you violate their next of kin in a bloody, violent, amputation-happy rage. Hell, let them take home a toe just for good luck. Or, you could just politely ask for the merchandise to be returned. Your call.
I always thought the guy that killed the king's two sons then fed them to him in a stew was pretty neat. You know in a macabre kind of way.