Ban Players From Your Clan For Good!

My Clash Of Clan Name is King Jose and I am leader of a clan called OP REMINGTON. Everything is great in my clan except for one thing only. We have this stalker who always wants to be in our clan and make fun of people. We are really sick and tired of him always coming back. And it's not just him we have other people who join, stick around for a while, make friends and leaves because the want to find a "better" clan. What happens after a day or two that the person leaves my clan!? They come back. Yup. They come back and say that they couldn't find a better clan so they wanted to come back. We have them on a banned list, but that's not enough. We then have no players who join and we don't tell them and when they get elder they let the banned people join and then we have to kick them out. I just think it would be cool if we had a banned list, so when they would want to join, they wouldn't be able to because red letters would appear saying "You have been banned from this clan for good".

Easy solution: don't give elders to random people.