What should I do in the face of sexual harassment by SMS from unit leaders?

This kind of boss had better ignore him. The more you ignore him, the more trouble you will have. Hey, don't text back. If you really think he will have a chance with a short message, then put on a good posture and work hard so that he will fire you if he can't catch the interface. That's all, so your job will be saved and there will be no adverse reactions.