If you feel that the lawyer was negligent, the you can sue him for malpractice for the amount that you lost. You can also report him to the state bar.
Normally, what the lawyer should do is get the agreement on the record and immediately get a proposed agreed order to the other side for signature. If a legitimate dispute arises due to an ambiguity in the oral agreement, then the lawyer may not have been at fault unless he could have reasonably avoided the ambiguity on the record.
If there was not an outstanding tax lien that existed before the date of your judgment, then you may be able to sue to recover the money back under the theory of a fraudulent transfer.
You can read more about that concept at the link above.
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