If there is no way to cancel the preorder then click on "Contacting Support" in the lower left of any forum page and eitherr call or start a live chast session. Only they can issue a refund. I hope they weould considering you haven't downloaded the game.
** Engage brain before putting mouth in gear **
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So am I SOL or is there a way I can get my money back..
All sales from the PS Store are classed as final, you can though contact Sony customer support & ask a representative to submit a refund request on your behalf, just so you know there is no guarantee that it will be granted, the error was after all your own.
Here's Sony's contact number, alternatively please click on the 'live chat' link in my signature to speak to a representative via live chat.
Mon - Sun 6:00AM - 10:00PM Pacific
EDIT: You beat me to it vfr!
Thanks guys I contacted live support.. Now I will wait let's hope they understand it was a mistake.
Like you said you can only wait & see, some are granted some are not, if it's the first time requesting a refund you have a better chance than if you've tried before.