Nuisance caller

Someone from an unfamiliar organisation rang wanting to confirm my details so they could "discuss my file". It sounded like marketing hooey, so I interrupted their spiel with my standard response to telemarketers: "Sorry, I'm not interested. Please remove me from your list. Thank you." I hung up and they immediately phoned back, insisting it was an important matter and, presumably to frighten me into co-operating, saying, "You haven't taken care of your responsibilities." I got angry and forced them to admit they were from a finance company. Super-suss, I agreed only to reveal my birthdate (they already knew my first initial, surname and suburb). Well, it turns out the person they're seeking was born in the '50s - 20 years before me. The nuisance caller tried to apologise and I made that difficult for them. I reckon they were systematically going through the phone book, bothering every unlucky bugger with a similar name, in a bid to fluke their mysterious defaulter. And after hours on a Friday, too. SCUM!