That is because we filled it with 100 calls so far today
This is one of their new scam numbers we shut down last one and will do the same if we all help

They are all local calls I checked  AT&T   first to make sure no hidden phone charges  

This is how to stop them  don’t make it easy for them by hanging up
Just keep calling number every chance you get THEY ARE FLIPPING OUT   the longer you keep them on phone will give them less time to mess with people we have successfully shut down many of these numbers by doing this back to them  
the best thing is to keep them on line as long as you can scam them back