I think they have people pressing 1 in an attempt to not have people taking up their time, so more duped people get put through.
There seems to be a new weapon against the scam call centres now that allows a program to bombard their lines and shut them down. The main guy I follow on youtube is Jim Browning.
Have a watch at this video. In the update video after this he has copied lots of files from the scammers computer and plays the .wav files, which is probably the message you heard.
Destroying a scam call center
[youtube]https://www.youtube.com/watch?v=RHHzoDqZL8M[/youtube]