I am having the same problem with my HTC WP 8s I bought in Thailand.
According to the Microsoft community, I am still on the update schedule for the region I bought my phone:
Don't receive updates on HTC WP 8s - Microsoft Community
HTC Support Thailand couldn't give me any info, HTC Support Germany (where I live) told me there may never be any updates.
The Telstra update status for both HTC WP 8s and 8x says "now deploying", which means it may not have been deployed to all devices yet. Maybe there's still hope.
Handset Software Updates - 6/03/2014 - Telstra Crowdsupport - 258997
I'm not sure if my phone is branded by Telstra (CID-HTC...044). You can check your CID by entering bootloader mode (turn your phone off, then hold down vol down, camera and power on buttons and release after the phone vibrates and the screen goes white. I think it should be Telstra, too in my case because my gf told me Telstra belongs to the ex Thai prime minister Thaksin (who was exiled for corruption).
I've been trying to unbrand my phone (search "unbrand HTC windows phone 8s xdadevelopers" for info on how to do that), but I can't change the CID (the first ROM "UEFI_signed.nbh" doesn't load). Maybe you'll have better luck than me... Let me know how it goes.
If the update ever arrives, sign up for the preview for developers program immediately. If your store isn't giving you any support, you don't need to worry about warranty voids anyway and you don't want to have to rely on HTC Asia or Asian/Australian carriers for further updates and support (even if Asia and Australia are beautiful places otherwise)!