unsolicited caller left no message

Said they were from Telstra technical department but couldn't tell me the name of the account holder. Got abusive when I started asking questions

Quickly hung up and called again off a private number.
Indian accent saying from "Telstra and they are receiving issues about our internet connection, ok?"... Asked what device I am using either Laptop or desktop.
I told them that they should actually know what I am using as they called this number. (*being a business) but they couldn't even tell me what business this was and who they called. So they hung up on me