I have had almost daily calls from similar numbers, first one (07) 2143 5123, voice message was a few minutes of white noise so I blocked, then a couple of days later I got (07) 2143 5124, no voice message this time but I blocked it too, today I got (07) 2143 5125. No voice message. Blocked again.

On the 3rd call I blocked it and reported it as spam.

Has called twice today and two times yesterday. They don’t leave a voicemail and when you answer it’s just blank and hangs up.