They called I answered and they said nothing

Called my phone, didn't bother to call back because they didn't leave a message.  I figured if they're telemarketers, calling them back will just let them know that I have a working number.

WCA offer clearing house ... call them back they will remove you.

Automated call.  Before I could do anything, I was switched to a live person.  hard to understand her (thick accent).  I told her that I worked in a school, and this number should be removed.  An automated process "removed" my number from their list.

I have their number recorded.... we'll see if they call back.

Keep getting calls from different numbers. always gives an option to be removed by pressing 7. I press 7, and it says my number has been removed, but every couple of days I get another call. i"ve tried calling the numbers back, and followed the prompt to get my number removed. It always says your number has been removed from wca author house's automated calling list, but they keep calling back