Don't be put off by the initial corporate response. Find a human.
The man you need to contact is ShootingPeople.org's Creative Director James Mullighan. When judging an unquestionable rip-off of your film the winner, he was looking for the following qualities:
"In choosing a winner, I was looking for assuredness, soundness of concept and overcoming of the natural impediments of making a film with such limited resources as a mobile device." - James Mullighan (source)
Assuredness is lacking if the copier can't trust their own ideas, and any credit for soundness of concept belongs to you. The winner accepted the prize under false pretences and the judge who put their reputation behind that deserves to know about it. They may also agree that you deserve credit for the work you put in, but it would naive to think that there won't be pressure from some quarters to smooth things over as quietly as possible.
All sorts of social media channels for ShootingPeople.org are listed here under a 'contact us' function promising a quick reply. An open door like that usually earns a private email in the first instance IMO, but it's your call if you want to ask them about it in Twitter, for example.
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Manic can teach you the secret of fire, Tue 22 Jun 2010, 2:01,
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^this^
Also, keep an eye on Wikipedia, to see if this compo warrants its own page.
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Pew Pew Pew! Lasers! wannabe Gong Farmer, Tue 22 Jun 2010, 9:06,
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