Contact Sony. There's a chance this person is using your card on the Sony network as well for a playstation id. If that's the case, they may be able to share the ip with the police. They recently shared the ip address of a suspected murderer and he was caught:
Murder Suspect Caught After Logging Into Victim's PlayStation Account

It's worth a try.

Best of luck; at least you've got the ball rolling now. It should get easier from here on out.

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1983 300TD 240k Thistle Green Auto (Euro) [sold]
1984 300D 240k Petrol Green Auto
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