hi
you need to file a Motion/Request to Cancel Judgment - form SC-108. where it asks you to state why - explain there was lack of or improper service.
and you will need to make sure that anything you file in this matter is properly served on the creditor and also file the Notice form SC-.form 135 you dont want them to be able to have it dismissed based on improper service.
and you also need to file form SC - 108A for the Order so the court can sign it if they agree with you
Attorney at Law
20 years practicing law