This is exactly the same for me. They call once in the morning about 10am then once in the arvo about 4pm. If i answer its just silence for 5-7 seconds then it disconnects!

The calls have been coming through to my direct line in Adelaide. Had about five of them in the past few days. Phone rings. I answer. They hang up and the calls are logged at between 5-7 seconds.

answerd and no one spoke

Just got a ring from this number too, didn't answer, but they didnt leave a voice mail or anything? Weird

Just had a call from this number, claiming to be from avon marketing acting on behalf of commonwealth bank.  sounded v dodgy, he was pretty cagey so i hung up! i don't trust anything from banks unless its through my netbank email!

Two calls today and no one there.  Very annoying as I am at work.  Definitely don't appreciate the interruption.

MLC life insurance on behalf of nab. I got their letter week before. They just keep talking and don't shut up. And my super has life insurance anyway.

Got a call from this number twice and no message.