For those suggesting the OP do a better job of reading the fine print--same to the GAs.
Not sure what his GA said, but I (who am aware of the change) have heard a GA say something to the effect of
"Christmas is coming and won't this make a great Christmas present to a family member?"
She was selling the voucher as if it could be used as a gift. Personally I am one of those people that read what they sign, and try to ask about the restrictions, but even so I think the basic tenets of customer service would be to inform people EXACTLY WHAT YOU ARE OFFERING. How about "Who will take a $400 voucher, good for your own use only?" Just prevents getting good customers upset with you for no reason.
And OP - I bet there is some leeway...I was told once they would let me stack two "new" vouchers due to my status (though in the end I didn't). Call and ask, though mine was closer to the "new rule" date.