You tell your employer to not garnish; that the judgment was not for that additional amount. Further, you order all three credit reports for free and see which reports show this judgment or garnishment. Then you basically dispute it with the credit reporting agencies so that they have an opportunity to dispute this charge and then you can see if this winds up simply going away. It can take up to 45 days or so, so be patient. Then, if you still get such letters, just ignore them and file a dispute with the state bar and state attorney general. Make sure you include the judgment, all relevant paperwork from your employer and proofs of payment.