The only way to deal with wrong numbers is to pretend to be the person the caller is looking for. In my latest case, I became 'Nas' or 'Naz'. I promised to buy the trainers she, the caller, was wanting and explained any irregularity in my voice was down to me coming down with a cold. It was quite a conversation.

If only I could be a fly on the wall for when she next meets 'Nas'.