Forum:Vandal on Galaxy Angel Wiki

Hello, there is what I think is a recurring vandal on a wiki that I admin, the Galaxy Angel Wiki. He adds pages that are either about things in Gundam SEED, or attempt to link Gundam SEED and Galaxy Angel. The problem is that their universes don't share any relation whatsoever, making it all false content. It is also clear that it is false content by the fact that sections of new pages will just be lifted directly from other pages on the wiki, and also the nonsensical references that he makes sometimes to things like the "Fake Hero Anime TV Alliance", and the "Cartoon Network military headquarters". He then edits other pages to link to or talk about these new pages. I believe on my wiki he has gone under the names Vandreadworld, galaxyangel, galaxyangelme, and the IPs of 122.53.163.155, 122.53.172.23, 122.53.172.158, 122.53.173.88, 122.53.164.72, 122.53.175.176 and 122.53.171.32. I have tried to talk to him on his user account talk pages, but have gotten no reply. I have blocked Vandreadworld and his IPs several times, but almost as soon as the block lets up, he comes back and either recreates his old pages and re-edits the other ones, or creates a new page with Gundam SEED related content. Recently, I have begun to block the IP range of 122.53.0.0/16 as well, but allowing for account creation; I would block a smaller range, as I don't want to be blocking off a large base of potential users, but this is the only range that covers all the IPs he has historically used. I was only blocking for a month at a time, but most recently I have begun blocking him for 3 months. It seems that in response to this, he made the accounts galaxyangel and galaxyangelme in order to continue his vandalism. I'm wondering if anyone else has had problems with this person, and also if there is any advice on what I should do. Should I be as extreme as banning the range 122.53.0.0/16 indefinitely and preventing account creation? Or should I just continue this cycle of reverting his edits and banning his accounts and IPs until he hopefully decides to give up? I have asked User:Kirkburn for some advice already, he has more or less advocated the latter. I would like to know if there are any other opinions however. Thank you.