Ilgiz, I have de-spammed your wiki a few days ago but it seems the spammer won't let go... I suggest you make it read-only for now so that the spammer lets go...
He won't give up and at one point you'll be fed-up and leave it as is...
Don't let that happen and go on read only and give the users' password to whoever you'd like or put an anti-spamming script...
-- Robert Abitbol