mann.. you got enemies it seems !!
1. I think, it cannot be a mass/group of people. It must be some ONE (or two).
2. Notice his IP and block it.
3. Keep blocking his IP and Username both (He won't register for his lifetime).
4. I think, you haven't enabled email authentication. Turn it ON and require unique email addresses and disable posting of Users awaiting email confirmation group. By this, he'll have to confirm his email address before posting. This is the best option. Turn it ON !!
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