You can contact our customer service department and they can talk you through how return for warranty consideration. Curious, did the shaft break at the hosel, or did the actual hosel of the head break? I have never seen the actual hosel of a wedge break from normal use in my 42 years in the industry. Seen them break while trying to adjust / bend them, but not from normal use. Assuming you meant the shaft broke at the hosel.
Return it and we will take a look at it.