Have to hand it to Ticketek, who've once again avoided an entry in the WCMO thread courtesy of a great customer service recovery.
Attempted to buy a concert ticket late last night through the Ticketek app. At the payment screen, I attempted multiple times with Apple Pay, direct Credit Card and PayPal, either receiving a "payment failure" error, or being told my session had timed out. At no point did I get an in-app confirmation of successful purchase. After killing the app and reloading it, I had a quick look at the "My Account" section and discovered to my dismay that not only had a ticket been purchased, but this had in fact happened more than once.
Filled out their online form to advise the issue and request cancellation/refund of the superfluous tix. Within 30 minutes of submitting the form, I'd received email confirmation from Ticketek Customer Support advising that the excess tix had been cancelled and the funds would be returned to my CC within 5 working days.