This sounds dodgy. We don't get the full message before having to select an option. They are calling every 10 minutes and when we call that number back we get the number is not connected.

An automated call to warn that my Telstra internet connection would be disconnected today. (I have no Telstra accounts.) I hung up.

This is an automated call forwarded from telstra to about your internet connection being disconnect. Dial 1 to be put through to telstra to discuss your internet issue.