My friend Andrew sent me this useful link to legally stop telemarketer phone callers here in Australia.
They are very persistent. Once I got 5 phone calls in one day from a telemarketer company trying to get me to change my phone company. The next week the same salesperson tried to sell me insurance. I recognized her voice.
So to Aussie readers - try this website.
It places your phone number in the government DO NOT CALL registry - and if the telemarketers call you after that- you can report them to the authorities.