Sometimes this is due to a mobile phone network providing a sim card with a temporary phone number while a person ports their own number to that network from a previous network via a Pac.
The phone is picking up on the old temporary number although your own number has successfully ported across.
I think the only way around this is to request your network sim swaps which is to move your number from your current sim card to a new blank sim card which has never had a phone number assigned to it @shazbot
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.
