Is it necessary to contact someone who doesn't answer the phone, send a message or return it?

If you want to find someone. He doesn't return messages or answer the phone, so you don't need to contact him again. There is no point in contacting him again, because he won't answer your phone. He doesn't want to know what you are looking for, and he doesn't reply to messages. He just doesn't want to contact you at all. Do you want to keep in touch with others? Then why bother you? You are so stubborn to contact others. Aren't you tired? Why are you so obsessed with someone who doesn't answer the phone or return messages? Just don't contact.