Company from Darwin claiming to be offering IPO investment opportunities. They knew my name. Asked the man where he got my number and name from. He said 'the IT department'. Told him that I was on the Do Not Call Register and asked them not to try calling me again, then I hung up. This was the latest in a series of unsolicited calls during the past couple of months from (08) Darwin; all with similar numbers. This is the first time I answered. I don't know anyone in Darwin, so now all 08 calls blocked. Call reported to ACMA.