1) Say the server is horrible and spam up the chat, it will show the owner how persistent you are!
2) PVP way to much, and tell random people what to do, the owner will see that you are a great leader!
3) Threaten the owner, tell him that the server sucks and that you will tell everyone that it sucks, he will see your good at advertizing.
4)If the owner still wont answer you, swear at him a lot and type random messages like, "cheese is better than peanut butter)
5) lastly, wait patiently and you'll get VIP, mod, or op in no time!