I started doing that once. After 2 or 3 of those time wasting calls, I got one that the person said "Thank you for playing , you will continue to receive calls" and they hung up.
IOW: They have so many resources available, and it is so cheap for them to make the calls, that even after they knew I was going to waste their time, they continued the calls.
This was after I had tried their options for "press 1 to be removed" and talking to someone and saying "please remove me from your list".
The thing they may not have been anticipating: I had 3 numbers forwarding to my cell phone. Up until this call I didn't know which of them was on their list. I cancelled that phone number, and the calls dropped to almost 0.