The key to keeping him dangling on the line is to repeatedly request bonafides from him. The absolute master at this is "The Scam Baiter" who gets these Nigerian scammers to do the most outrageous stuff on film just to prove they are legit. Of course a lack of english from the Nigerian scammers helps in the fun, but I'm sure you will glean ideas for going after Mr. Nowak with more finesse from this site;
http://www.thescambaiter.com/