That can happen and it is frustrating.  So you are back to ignoring or letting calls go to voice mail. I am assuming you know not to answer or call back calls from unknown numbers.  Engaging these swine just encourages them.

You may find from your notes that certain area codes are associated with scams, and some call blockers will block by area code.  I had the problem of changing numbers and it took several months of ignoring calls to get rid of one scammer that was the biggest offender.  I just ignored the calls, i have a easy way to drop the volume on the ring tone.  Keeping records and having a plan/system will pay off -  Good luck with your fight and keep checking back here for ideas.