Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your phones and this number.
May I ask the MODEL of your Panasonic system? That model should be printed on the MAIN BASE UNIT of the system and start with KX-TG.
Can you also tell me if you can SEE the Caller ID of this person in the "caller list" - with an icon displayed next to that number that looks like a "phone receiver" with a line through it?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved?
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)