Caller: Said they were telstra

One indian sounding female whom I was on the phone with and one indian sounding female in the background. Said they were telstra, asking if I’ve been having wifi issues at home, said they were going to check my account. I assumed it was a scam and ended the call. As I very much doubt telstra would be using a Mobile number to call customers as should you be skeptical about it. Once I ended the call however, they immediately called me back and with a bit of a tone they asked why I ended the call on them. To which responded by ending the call once again and did not receive another call.