can a judgement of a divorce be contested

This can be contested because you were not notified.  In order for the divorce to be finalized, the party who is the plaintiff would have had to prove that he/she served the defendant with the complaint.  What ever was submitted to the court as proof that you received the papers must have been false.  You can get the documents from the court, they are all public documents once they are filed with the court.  Find the proof of service and see if your name was forged, or some other false information submitted, and that will be the basis for your claim that the divorce is to be invalidated.