Missed call - Probably a NAB scam!!

Claimed to be from NAB, claims there was an unauthorised request from john smith for 900 bucks. Sounded suspicious, could not give me a NAB reference number to call back and wanted me to log into my account to check in real time. did not do it. looks like a scam call https://www.nab.com.au/about-us/security/fraud-warnings-for-all-nab-customers

Claimed to be from NBN. Asking silly questions. Claims that there is a security issue with my internet.