Caller: I answered and they hung up.

I called the number back and got a recorded message saying “due to technical difficulties at this time we are unable to connect you call, please call back at another time.”

I consider any unknown caller a scam if no message left!

Answered to this number and said they were from "telstra" confirming internet is down and checking in.... and i told him sorry cant hear you and they hung up lol ... called back and number not valid

I said poor connection and who was calling - they hung up!!

I called back the number (02) 9099 5621 and the lady on the other line said the company name is BMB Tech