Harriet received notice of her upcoming tribunal hearing the mail. She was instructed to provide written submissions, to which she did. However, Harriet heard from a friend that tribunals cannot prevent her from having an oral hearing. Despite her attempts, Harriet was denied an oral hearing. Harriet was also denied the opportunity to cross-examine witnesses presented by the opposing party. The final order of the tribunal was unfavorable to Harriet.

Harriet has retained you as her legal representative. She instructs you to "do something" about the evidence presented by the opposing party. What would you do?