Automated call regarding possible service interruption?

I got an automated call on a Sunday morning to my mobile phone that rambled on about upcoming service happening in my area after midnight, something something I didn't hear because I was otherwise busy and could not take the call right then.

I logged into the billing/management website and can't find any indication of this upcoming service. I was hoping to find the details on there, like some other utilities do.

Any idea how I can go back and find out what the message was saying?

Why did they call my mobile phone when it's not configured on the site for alerts?