DH & I got rid of our land line for a couple years, but sometimes he'd be trying to call me when I was home but I wouldn't hear my cell phone because it'd be downstairs in my purse.
So we re-installed a land line but we didn't give the number out to anybody. He and I are the only ones that should ever be calling on that line. Eventually, of course, the spammers and telemarketers found the number.
But since I know it's either spam, a wrong number, or rarely it's DH, when it rings I have fun with it.
My favorite is to just pick it up and say, "Passphrase, please". They'll pause, start to talk, and I will just say, "That is not the current passphrase" and hang up.
Or sometimes I'll act like I think they're someone who I'm arguing with calling back and start making up crazy stuff. "LOOK MARSHA, I told you I don't CARE what your excuse is. There is no way I am going to forgive you for shaving my dog and painting it blue!!!"