You haven't reported a crucial piece of info. Do they recognize their error?
If not, then they're stubborn and it would be easier to find a new crew than to correct them.
If so, then it's only a matter of changing their habits. Get the whistle farther from their mouths at the snap so that an extra decision is required. Remind them during every break in the action.
Finally, enforce it correctly: it would be both a foul and an inadvertent whistle (4-2-3d). The defense probably won't realize that they've been ripped off (since they'll get the advantage of the penalty), but that's the right way to handle it. Doing it that way will also reinforce the new habits.
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Cheers,
mb
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