Caller: Possible scam

I’ve been receiving quite a number of unsolicited calls from unknown scammers. They seem to be able to infiltrate other viable phone numbers. I didn’t answer this call initially when it rang out twice. I’m calling back it was identified as a legitimate ”hello world” Travel agency in Queensland. They however did not recognise the number 3855 5092 that came through to them when I called twice once on landline and then on mobile.