New Zealand Law
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Was this a cash purchase? This is unlikely to be binding on you personally if you didn't sign it. If they have made errors in the GST then you are entitled to a refund. If they refuse, you can claim against them in a special tribunal called the Motor Vehicle Disputes Tribunal which you can find at this link. You don't a lawyer to claim there. Your husband could file the claim and ask for the contract to be clarified as to the name of the buyer and claim the overpaid GST.