Any transaction questions as far as preorderos/cancelling orders must be done directly through the retailer. I know personally that it is stated in PSN's digital content store that those transactions are non-refundable. You'll have to talk with the guys at [url=https://support.us.playstation.com/app/contact_options]Sony Support[/url].
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Thanks, I think I'm going to just stay with the digital copy rather then attempt a cancellation and risk not getting a copy at all :)