Did you get a notice? I assume this was criminal court? You can go to criminal court and ask them where you should go
I would go to the same court and explain what has happened, because at least they can see that you're serious about community service but your lawyer is unavailable. Or like Yisroel mentioned call another lawyer but from the same firm your lawyer works at. Hopefully everything works out for you, best of luck.
I would call a different lawyer and see what they say.
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