Welcome to the Community @Sobakitty
We've created an article that will guide you on how to check your account information, usage and calls online. Here's the link: TPG My Account - Checking your calls and usage online
In your case, due to nonpayment your account was terminated. Email notification was sent to the registered email address on file since November 2019 but we did not receive any response.
Terminated accounts can't be reactivated.
If you require the service, it will be treated as a new application/order and will be processed by our NBN sales team (1300 720 016).
Let us know if you need further assistance.