The caller with the number +64298579140 is likely involved in scamming activities, posing as a representative from a telecommunications company, in this case, Telstra. The caller claims to be from the billing department, which is a common tactic used to gain the trust of potential victims. However, the recipient of the call does not use the company's services, suggesting that the call is a phishing attempt to obtain sensitive information. The caller's unknown identity and the mention of harassment calls further support this conclusion.
They say they’re from Telstra billing, but I never used that service – never will, honestly.