Claimed they were calling from the Telstra Technical department about unsafe internet connections & viruses potentially on our computer.
When I explained he had called a business, his reply was "Oh, I wasn't looking for a business, I was looking for a person".

picked up the phone, and didnt hear anything from the another side.

When I answered there was no one at the other end.

Have called tree times in two days
Saying they are from Telstra about an email address
We don’t have one!
When calls not answered no message is left

Didn't leave a message, so assume scam or telemarketing