How defaults happen
Most defaults come from missed deadlines, papers served at an old address, or service that never actually happened. Check the affidavit of service carefully.
Moving to vacate
A motion to vacate typically argues a reasonable excuse for the default plus a meritorious defense, or that the court never had jurisdiction because service was defective. An order to show cause can pause enforcement while the motion is decided.
Stopping enforcement
If your account is restrained, certain funds such as many government benefits are exempt. Ask for a temporary stay in the order to show cause.