Caller: Pretending to be from Telstra

Calling to tell me that someone is using my internet, and my internet password and they are alarmed, and my internet will crash down at any time. Then trying to find out how many devices I have, what kind of devices and etc. I told them I have 50devices, and none of them are computer, ipad, iphone or android. Then they ran out of their options and hung up on me. They had strong Indian accent. Their details will be reported to the police.