Report it to Watchdog, Citizens Advice, the police, the Fraud Office, Trading Standards etc etc. He should be traceable so then go to the small claims court as well! You have his number, I would be tempted (but not sure how legal it would be) to post it up here and get other people to phone him and swamp him. You could also borrow someone elses phone to phone him, he would not recognise the number - that is how we catch out our errant apprentices here at our college, hehehe
Good luck mate and keep us posted (no pun intended) with how things progress!