recorded message regarding Amazon charge again. Third time in 2 weeks. Stop these people.

Recorded message- My Amazon account will be charged $79 this month- press one to change this?. I don't have an Amazon account. This number is an Optus Disconnect.
Why can't the Telcos make this stuff stop- how are they getting access to disconnected numbers????? I am also on the "Do not call" register yet I get calls everyday.