The court texted me to tell the defendant, but I don't know the defendant.

I feel that this is a short message from a liar, and the court has a request for handling a case; At least send an official letter to let you know why you are looking for you, and let you know what you should do. There are at least two case handlers. A text message like yours, he said it was from the court, but he didn't go through the court formalities. There is really no other possibility except being defined as a liar!