If someone forged a DocuSign document I never signed, how to prove that I never signed it?

I have good reason to believe that a real estate agent may attempt to forge my digital signature on an agreement that I never received, nor signed.  The signature ID underneath doesn't match my email linked DocuSign signature ID. I already explained what I found in the court. Unfortunately, the judge accepts this forged document without verifying with DocuSign. Is there anything I can do? How can I prove that I never signed it? I really need some help!