I have a phone number "stuck" in notifications

I have a phone number "stuck" in notifications.  I got a call (spam) on 11/30.  I deleted it off my iPhone and blocked it.  I also deleted it from the notifications on my Venu 4.  A few days later, lo and behold, there is the phone number again.  Its still listed as 11/30.  So i again deleted, and it came back again. Done this 4-5 times.

i even did a reset, and back it came.

Any idea on how to be rid of this once and for all time.

Thanks

Len