To get money back out from PSN Wallet, you may have to contact Sony. However I don't think it is possible transfer funds out from PSN Wallet once the money is deposited.
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As far as I know, once PSN has your money they will hold it indefinitely. Someone pointed out terms and conditions a few days ago in a related post. Don't remember the thread though, sry =/.
You could always call Sony though, like someone above me pointed out. They have great customer service.
Sucks that this game is cross-platform. We have to share the server with PC gamers and they are clogging the server with their bot. Fucking pest. PC botters should just stick to Hello Kitty online, or Candy crush for that matter.