Well the good thing to do is to mute them for prob 9 seconds then unmute them And If they keep asking mute them again for 20 seconds and If they do it again Kick them, If they come back and do it again Tempban them for 5 hours After 5 hours If uR Server is still up Just perm ban them!
Now To stop a spammer Just kick him.......After Kicking him If he comes back and spams again Tempban For aslong as you want :) That should Do the trick :) Have fun!!!!!!