Telstra must be trying to compete with Optus' double data offer by offering double data on their recharges too.
$30 - 6GB - 30 day expiry.
$60 - 12GB - 90 day expiry.
$90 - 20GB - 6 month expiry (185 days according to their site)
$150 - 40GB - 1 year expiry.
Ends 13 February 2017.
Good for if you require Telstra coverage. Otherwise Optus or Vodafone is cheaper cost per GB.
Optus is $130 for 44gig with 2 year old expiry.
Far from trying to compete.