Got the same text, it comes from Telstra so someone who works for them is doing it. Most likely a Indian/Pakistani as Individuals living in Australia have been hacking Telstra lately. These same people have links to drugs.

Got an sms from this number, selling Oakley sunglasses for $21 [RRP $160] so basically a scam.

No idea how they got my number. Went to go on website link but Virus protection said it was a malicious site. avoid.