How do i stop Telemarketers from Calling me?

I live in Australia, and in the last 24 hours i have gotten 6 calls from the same crap group that keeps claiming they are from Telstra and are trying to get me hooked on some fake plan that is supposedly "Cheaper " than what i am currently on as a "Reward for paying my bills on time" even though... show more I live in Australia, and in the last 24 hours i have gotten 6 calls from the same crap group that keeps claiming they are from Telstra and are trying to get me hooked on some fake plan that is supposedly "Cheaper " than what i am currently on as a "Reward for paying my bills on time" even though i am not with Telstra and the plan they are offering is more expensive than what I have. We have told them 4 out of the 6 times to stop calling us and demanded to be put on a Do not Call list. But they just keep calling.What can i do to stop them?
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