I'm afraid there's not much you can do unless you can prove ownership of the account the neopoints are on to try and get it unfrozen.
If you were chain iced, it sounds like you weren't using good proxies. A tip for next time, don't transfer all the neopoints to one account, spread it along several accounts and self-freeze some of the accounts used for transferring along the way. Always let the neopoints sit for a few weeks before pooling them all together. Better safe than sorry, and better luck next time!