Random caller "Hello, I'm James from your broadband provider. We've noticed your broadband hasn't been running properly recently"
Me (With echoes of "Beggars, Moochers and Scammers " springing to mind. "No. It's been fine"
Puts down phone on him even as he's asking "How do you know?"
The real broadband provider confirmed they hadn't rung me, and told me to get back to them if it happened again.