Welcome to TPG Community!
We've managed to check your mobile account and can confirm that your outgoing call to international number is enabled.
This issue on your mobile is currently being assessed by our Senior Mobile Specialist and you will be contacted directly via call within 24 hours for further updates.
Meanwhile, you may check out this community article regarding
Troubleshooting issues with Incoming/Outgoing Calls on TPG Mobile
Let us know how it goes.