Managed to snag 2 x F CDG-SYD on TG via the screenshot method. Received a confirmation email with a request to call them by 11am Colombia time or the reservation would auto-cancel. Surprising, as I had included my phone details and was expecting a call as per most of the experiences detailed here on the forum. Worth noting that there was only a four hour window between receiving the email and the supposed cut-off time.
Called the Bogota number, went straight through to an English speaking operator who conferenced in someone from the "payments department", and acted as interpreter. All done with the call in fifteen minutes or so.
2 pax = 130k miles and USD1808. From start to finish the process took about 30 hours. Happy with that!