[AUS] I’ve recently turned 18 and I’ve gotten these calls

I turned 18 years old in Feb 2026 and I’ve recently gotten some calls. I had a normal number has called twice. One yesterday and one earlier today. And a different number called last week then a text message from a contact named ‘321’ said I had one missed call. Another number called and it updated to two missed calls. The message I got says: “Pls call 321, You have 2 new VoiceMail messages.” I checked my contacts and I don’t have any new voicemail messages, I only have 5, the earliest being November of 2025, which was from my grandmother. Are these calls scams or government related? (I haven’t gotten registered to vote yet. Maybe it’s related, I’m not sure)