If you don't know don't claim the wicket, you cheat. Plain and simple.
Vettori should just call Ponting on it and say yes we think Haddin is a cheat if he said the ball hit the off stump. It clearly didn't, and he had to know that, or at least not be sure- ala Graeme Smith.
If you don't know don't claim the wicket, you cheat. Plain and simple.