If your blocker is full, you can eliminate the oldest number to make room for the newest scam number. I have to do this. I figure the scammers have already moved on from the oldest number anyway.
There are several other things you can do. For instance you may be able to block by area code. You can get another blocker to add capacity or replace the one you have with one that has more features. The problem with removing a number is that you may start to get calls from it again.