Number probably spoofed. Doubt it would really be Derby WA calling me. Silent robo call

Answered the phone & a female voice said that she was from Telstra & the call was about my internet. At no time did she ask for me by name or call me by my name. The call did not last long before she hung up. I was a little disappointed as I did not get a chance to do my "proof of identity" request with them. I usually tell them that Telstra puts me through a proof of identity when I phoned so I am going to do the same as they phoned me. I then ask them to tell me something that only Telstra & I would know, e.g. how much my last phone bill was, then I wait for the excuse(s) as to why they can't or a guess or for them to hang up. SCAMMERS, SCAMMERS, SCAMMERS.