calls everyday

All mobile numbers starting with 0488 and 0480 in Australia are from a Telemarketer called Super Information Team! They also have Melbourne land lines, I don’t know how they have got my confidential information! I am sick of their everyday annoying calls! Don’t know how to sue them or at least block them! They have lots of numbers that seem to me to be impossible to block all! Don’t know why Oz government allows them to disturb OZ residents all day everyday! Who is responsible for this shameful actions?