Didn’t leave a message

i had a call from this mob# but when answered they hung up. I called it to see who was calling me & it was a message to say it was disconnected. So how does that happen? Making calls from a disconnected number??
A scam of some sort i would think.

Caller: Scammers

This is an old scam, once you press 1 it gives then access to your phone and everything you are trying to keep private.

They said I had missed a call from my service provider and they were cancelling my internet in 24 hrs due to illegal activity on my line. To speak to an Executive I had to press 1. Which I did and it went no where.