an hour ago
45m ago - last edited 40m ago
I think you need to get onto WhatsApp about this.
It's not a 48 issue.
It may be that it was a number that was previously used by someone else, was registered on WhatsApp, but has since been "recycled" and you got it but it's still registered on WhatsApp.
Maybe this is relevant?
If you want to get a different number on your 48 account then you'll need to contact 48 support to see if they can assist.
See the links in my signature below.