[...] he was never banned here and is still a member of this place [...]
Maybe... hopefully he's still allowed to be a member in hopes of catching him somehow? I don't know.
Please keep in mind that CPF staff makes every effort to stay out of personal transactions.
Furthermore, CPF policy has been relatively consistent over the years in regards to letting members who are suspected of fraudulent activity remain a member of the forum as long as forum rules are being followed. For example, providing the other party the option of replying to the relevant issue in-forum would probably be at least some sort of a net-benefit compared to ensuring that they are not allowed to post any information at all.
IIRC, at least once this has resulted in an eventual positive outcome, to my knowledge.
... and to paraphrase Forrest Gump, 'and that's all I've got to say about that'.