For a while I was getting a crazy number of "Rachel with Card Services" calls. Sometimes a couple a day. Usually at least one a week. And I'd block it and report it to the FTC site every time. I'd also use their "press 2 to be put on our do not call list". Then I'd press 1 and ask to be put on, but usually I couldn't even get half the sentence out before they had hung up on me.
Not sure what all these calls were accomplishing.
So I eventually started messing with them. Just wasting their time for a few minutes, acting clueless, until either they hung up or I got tired of it and told them I'd keep wasting their time if they kept calling.
Then in one call after I messed with them a few minutes, they said "Thanks for playing <my phone number>, you will continue to receive phone calls."
Let that sink in.
They knew I was just wasting their time, they knew how many phone calls they had made, they were fine with me wasting their time.
The flaw in their plan was identifying my phone number when they said that. I had 3 or 4 numbers going to my cell phone (Google voice, an old home number via Asterisk). This call came while I was switching from Verizon to Project Fi on my Google Voice number, and they identified that they were calling my Verizon number. I loved Project Fi, so I cancelled my Verizon number.
Pity the foo who got that number assigned to them.