The swap happened on the supported wallet and exchanges, Binance included. If you're not aware, you can check this blog from the team and the announcement about the launch.
I'm not really sure if you can get your tokens back, the best thing you can do is contact Theta support team directly for assistance.
That's exactly what is going on! I contacted Theta support and they said I will gain my access back once Ledger Nano will support "new" Theta.
Thank you for your help!
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