A man with an accent called saying they were from the “Mastercard and Visa Security Team”.
I hung up after that, very confident if it was an issue with my credit card I wouldn’t receive a call from a mobile number

Says they were from telstra. Definitely not, she didn't even sound like a good scam

Caller: Telstra scam

Said there was a problem with my internet could I log into my devise at this stage I said no I would be ringing Telstra direct

An electronic caller indicating I have an illegal internet connection and requested to press 1 to talk to a service provider

Caller: scammer pretending to be Telstra

my internet connection isn't safe.
got very abusive when I wasn't able to follow her terrible instructions
probably not the kind of language you would expect from a Telstra representative.