Caller: NBN

One call, no response when I answered, then robot voice said"goodbye"
Second call , 45 mins later , said he was from Telstra (in an Indian accent ) and tried to tell me my internet was not working properly, I told him it was fine, and I had had a similar call 30 mins earlier (that one was supposedly Telstra) and he said, how do you know your internet is fine., could not understand him, could not be bothered wasting my time, so hung up. ("Telstra " guy said my internet hasd been slow the past few days, which I said was a lie as we have been away 3 days , just got back, and no-one was using our internet!