Well that's a new one (for me). Got a text this morning from an unknown mobile "Can you text me?". Not the strangest SMS I've ever got so I reply "Who are you".
Then they replied "You called me" with a screenshot of an unanswered call from my mobile number. Weird. Checked my call logs and no calls out this morning at all. So I replied with that info and they seemed happy. Could this just be a telstra stuff up or something more sinister?
Your number has been spoofed to spam others.
Not unusual nowadays.
Give it a couple of days and the spammers will be using another number.