You are lucky! Even though we are supposed to have a silent number, we are still plagued with telemarketers -I think Telstra just sells them block lists of numbers.
Still, could be worse. Years ago I lived in a sharehouse, in which one of my housemates was a distant relative of a famous television personality, and had the same unusual surname and the same first initial. We got calls at all hours, everything from declarations of undying love to whistleblower calls on an astonishing number of scandals. They wouldn't take no for an answer, even when we repeatedly explained that no, the person who lived here was the wrong gender, and he was a traditional musician rather than a current affairs reporter, and we didn't even own a television set. The responses tended to "Yes, yes, I know you have to say that, but this is really important, so just tell her that....." . It got very annoying.