It seems like you've been targeted by a series of suspicious calls from a New Zealand mobile number, likely from a scammer. The caller is probably using a technique called "spoofing" to make it appear as though the calls are coming from different numbers. Since you don't live in New Zealand, these calls are almost certainly unsolicited and potentially harmful. If you continue to receive such calls, it’s best to ignore them or block the numbers. Be cautious about sharing any personal information, and consider reporting the calls to your local authorities or telecom provider.
Three calls arrived within three hours, each from a different "mobile service" number; I’m not a NZ resident but visited on holiday earlier this year, and this is the first time encountering such calls