It is difficult to be certain from the information provided, but it very much looks as though the Court considered the request by the opposing party as an oral motion. As the reopening of discovery is a procedural issue the court did have discretion to consider an oral motion. If the request was made during the same proceeding where the trial date was continued or the first appearance by the parties at Court after trial was continued by the Court on it's own, then it was completely appropriate to ask to re-open discovery at that time. Other than possibly causing further delay and cost what would you hope to gain by requiring the filing of a written motion? Unless there is a showing of undue prejudice these requests are granted the vast majority of the time. You should consult with an experienced legal counsel in your area as soon as possible.
Answered on Jan 18th, 2016 at 4:45 PM