This number calls once & hangs up. The number will appear as (02) 1670 717228. DO NOT phone the number back. If you do, monies will fraudulently be withdrawn from your bank accounts.
Refer to this website regarding police warning etc. Police issued warning in October 2019.
https://www.dailymail.co.uk/news/article-7532183/Missed-phone-call-scam-international-numbers-steals-thousands-Australians.html