Caller: Said Telstra

Im with Optus, they played a recorded message to say our landline was being disconnected. I got the phone off hubby, lady came on and said they were from Telstra. I repeated we were with Optus and a private number. She said she was calling as there was a fault with the line. Then said are you in front of your computer. I asked her for her phone number and I would call her back. She hung up.....Scam