The comment about "£250000 after 4 weeks vs. £5000 after 6 months" is really interesting. Curiously, whenever I've had something to complain about it has turned out to be outside Payphoneplus' remit in some way (*). Perhaps this is because the scammers actually are put off by by their "teeth", and so avoid them; in contrast they aren't put off by the non-teeth of Ofcom or the Information Commissioner. If this is true, let's expand their scope. Or give more teeth to those other bodies.

(*) e.g. "national rate" numbers, where they make a profit from you calling back but it's not considered premium rate, and international scams (florida vacations).