There's a user creating multiple accounts and not giving up in vandalizing. We are blocking his accounts but he continues to create more. He adds bad words in pages and even Thriller lyrics. It is happening in All of his accounts are blocked but he might create more like 8, 16, or maybe even 30! Is there a way to stop him from preventing account creation? We already selected "prevent account creation".

Here are the users that the vandal is using:

He has more than 2 accounts but I can't remember all of them.

All of them are blocked but more might come soon.