Employment provider we can find the best match for you if you answer some questions. When I interupted to tell them i was retired they kept talking, must be a recording

I can't speak but I LOVE answering the phone on telemarketers.  I pick up the phone but obviously say nothing.  It screws their robomachines up, and if it's a real person they just keep saying Hello??  Hello??  Until they give up and hang up.  THIS number was a real person, asking if I could hear them.  WARNING!!!!  DO NOT SAY YES!!!!  I could hear them just fine..........but they heard NOTHING from my end!!!  When did the DO NOT CALL LIST become the PLEASE CALL LIST????