I've had a few recently. One while I was at my mum's and one when I was playing with my son at home. I strung them along both times for about 20 minutes each before I got bored and told them that they weren't going to get anywhere with me. The joyous swearing at me that I received afterwards I should have recorded. Next time I'm going to string them along and tell them after a certain time that I've traced their call and that I'm working with as a part of an International Cooperative anti-fraud team and that local authorities will be coming shortly to their door.