According to the laws of China, goods that pass off other people's trademarks are tort. If someone is found to be counterfeiting your trademark and engaging in related business activities, you can bring an infringement lawsuit to the court. Before formally entering the proceedings, the court usually issues a summons to the defendant to attend the proceedings. The validity of the summons has legal effect, and the defendant shall go to the court to argue in court according to the requirements in the summons.

Of course, if the summons is formally issued by the court and certified by the court, it will have legal effect. Therefore, the court confirmed and guaranteed the validity and effectiveness of the summons. If the defendant fails to appear in court according to the summons, the court can take relevant legal measures, including compulsory summons and punishment for his overdue appearance.

It should be noted that I am an expert in government affairs and know a little about legal issues, but the handling of specific cases needs to be judged according to specific circumstances. If you are faced with such a problem, I suggest you consult relevant legal professionals for more detailed and specific legal advice.