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Hey Boother, welcome to CrowdSupport.
@Jupiter is right, that kind of speed is possible over 4G, particularly by a "computer" computer, as opposed to a mobile device or a tablet. One of the reasons the data usage is different, using browsing as an example, mobiles and tablets are configured to pull the mobile version of a page, which are optimised for the device (unless the device has been set to request the desktop version). A laptop or desktop, even using a 4G device, will pull the full desktop version of the page.
My money is on a software update of some description coming down - operating systems are particularly indiscriminate about an internet connection, they see it's active, they see there are updates and download the lot.
It's disappointing your call back was not received, has this been followed up at all? If not provide the reference number for the call (examples here: What Reference Numbers can I obtain from Telstra?) on which the commitment was made and we can pursue that for you.
Agents will be able to see THAT the data has been used, however we won't be able to provide an exact answer as to WHAT the data was used for. To do so would require us being able to see everything you do online, and while technically possible, it's been decided that what our customers do online is no-one's business but their own.
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