A warm welcome here in the Roku Community, @charlibraps!
Thank you for letting us know about the remote issues you've been experiencing with your Telstra TV3 Roku device. We'd be happy to assist you in contacting the proper support for this.
Since Telstra manufactures this, we highly recommend contacting their support for further clarification and assistance. They have the expertise to manufacture their own hardware devices, so they would be better suited to provide you with the best possible assistance regarding your remote issues.
You may reach them here: Telstra TV Support
Once again, we appreciate the troubleshooting steps you've taken, and we hope you get everything sorted out soon so you can continue streaming.
Best regards,
Carly
Carly Y.
Roku Community Moderator