they try get you to download a fake banking app for "suspicious transactions on your bank account". do not answer, do not respond, its all scams. other number is (03) 7044 2107

No message left when I didn't pick up, scam looking at the other comments here.

Recorded message telling me there had been suspicious activity on my visa card. I hung up.

Repeated calls

Caller: Telstra

Claimed to be from Telstra and was calling about my slow internet that he can help fix. I said my internet is not slow and I'm not with Telstra. He said, sorry I meant Vodafone. I said, not with them either so nice try. He got really annoyed and said hes just trying to help fix my internet so can I please listen to him as he can fix it quickly with remote access to my computer. I hung up.