Welcome to the Community!
Thank you for your query. Since we are a prepaid provider and upon activation of International Roaming, TPG will take out an amount of $500 which will be used to cover the roaming charges.
Any unused amount left over will be credited back to your account within 30 days after you have switched off International Roaming. You contact us on 13 14 23 Option 2 + 3 or send an email to firstname.lastname@example.org to request for refund.
For more information, I recommend checking this link: International Roaming
Please don't hesitate to let us know should you have further queries.