A quick scan of Georgia Garnishment rules, found here:
http://www.gcacsite.com/counties/Magistrate/garn.html
shows that, in nearly every case, there must be a
Judgment in place before an employer can honor any garnishment request:
HOW TO FILE A CONTINUING GARNISHMENT IN THE MAGISTRATE COURT OF THE COUNTY
1. You must have a judgment against someone before you can file a garnishment.
HOW TO FILE A REGULAR GARNISHMENT IN THE MAGISTRATE COURT
1. You must have a judgment against someone before you can file a garnishment.
Now, all that remains, in case they don't stop, is to make sure the payroll dept, and any attorneys for the company, are noticed of the particulars of the Georgia law, and to not honor any request for money from debt collectors (whether it is CC or taxes) without a judgment.