[Osem]

Just a thought but might it be worth him changing his phone number? If this is just another scam his current number may already be on a 'suckers list' and that wouldn't be good news. A good mate of mine once entered into a fairly brief dialogue with what turned out to be a 'boiler room' operation who called him out of the blue. Thereafter, despite being ex-directory, he was regularly pestered with entirely unsolicited call from all manner of dodgy outfits trying to get him to part with some cash.