Gordon, I get one of these calls every couple of months and have great fun with them if I'm in the mood and not busy with the time to spare, the trick is to go along with the scam a bit, pretend you're old, a bit deaf, even ga-ga.......... ''wot's that my dear, my computors going wrong?, oh! deary me, which one is it then?......I've got 5 you know.... oh I can't see the numbers on the back because I can't turn it over, it's too heavy, I've got such bad arthritis, do you know a good cure.. etc etc. In fact anything to make them waste their time .
I manage to keep one goon on the phone for over 15 minutes by being deaf, daft and repeatedly misreading a ficticious [but plausible looking] string of numbers and ''forgetting'' where I got to, in the end getting him to read them back in the phonic alphabet , which unfortunately for him he did not know properly, so when he read back ........''niner alpha charlie father [instead of foxtrot] ....my response of ''but you can't know charlie's father he died last year'' sent this clown from Bangaloor or wherever ,was almost in tears of frustration....... all rounded off with a hearty bit of Anglo Saxon instructions to go away!
Trevor