Can we just ban the spammer's whole IP range?

[Vintasticvin]

ip ban pl0x

Can't stop, won't stop Black Magic Babji!

[Maenara]

Every wave of spam has the same phone number across its messages. The number varies between waves, but is same between messages. Check for a large amount of topics (5+?) from a single user within a short amount of time that contain similar number strings in their titles.