Because this was a verbal agreement, it is literally a "he said versus she said" situation. The Court would rule based on whoever is more believable as to what was agreed-upon. In addition, if you have any texts, emails, or other proof of your version, this would be helpful in advancing your version of the events.
An attorney is recommended but not mandatory. In addition, know that the Defendant (i.e. you) should file an answer with the Court to avoid a default judgment. A copy of the answer must also be sent to the Plaintiff. I am including a sample answer with this reply.
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