Received a call from this number 3/5/18 saying they were calling from Telstra technical services. Same number again 4/5/18 saying they were NAB.

Scam Caller - One day they are Telstra and the next they are National Australia Bank

It is a scam the voices indians and they say they are from telestra technical support. We were just about to fall in the trap . How telestra can’t stop such a very annoying calls it happens daily .

Scam call saying they are from NAB regarding our account. We don't have a NAB account.

This scam is relentless. I receive calls daily and more than once a day.
Surely there is a way of stopping this scam.
When I reported it to Telstra they said they would block any interstate calls however I am still receiving them. Telstras other suggestion was to sell me one of their Guardian Handsets.

Purports to be from the Security Dep't of the National Australia Bank. Claims he needs to stop the fraudulent transaction that was made on my NAB account today. He gave an amount and a name, which I knew was false. Please beware as it's a scam. I didn't give him the chance to ask for my password or any other details of my account. I just said that I would check the account, myself and closed the call. No such mentioned transaction exists even though I do have a NAB account.