Again, this is a court order. 

The way to address this is... in court.

You had the opportunity, when this went before the judge, to request information in discovery.  If you di not show and this a default judgement, that's on you.  If you represented yourself because you felt you could not afford a lawyer, then compare what you're being ordered to pay to what you would have paid in legal fees as part of a cost/benefits analysis.

How recent is this order?