You file a motion to set aside the judgment and quash the garnishment.
The clerks cannot give you legal advice about how to do it.
The Mississippi Rules of Civil Procedure addresses that in Rules 60, 61, and 62:
https://courts.ms.gov/rules/msruleso..._procedure.pdf
You might be able to find sample motions with Google.
Or, depending on the size of the judgment, you might want to talk to an attorney.

