I have a land line tied to my cable account. I never use it. It is infrequently answered. For fourteen months it has been in place and it now gets about a dozen calls a day — all junk. It is answered about once every third day just because my wife wants to see what the current scam caller is about.
The call frequency is not decreasing —perhaps increasing.
If you have a desktop and install a cheap modem and use a splitter to plug in LL phone line to it, and install Phone free 1.39 (I have it) then you can set it to zap and not notify you of spam calls. Plus it can keep a record of all incoming calls. One reason i use Windows, thank God.