answer call nothing but dead air. voice comes on goodbye..

Received short muffled call that ended quickly.
Immediately phoned number back but it was not available.
Immediately received text from same number "Please phone your phone provider and complain about this call as I think my phone has been hacked. I called.mine and they tell me they wont do anything about ot"

Caller: Scam caller pretending to be from Telstra

When I asked him to prove his identity by sending me an sms he hung up