I've managed to locate your account and have successfully sent the requested Invoice to the registered email address on the account (month of December - pdf format).
For future reference, you may also check out these Community articles:
Using TPG My Account & Online Account Info
TPG billing cycle and advance payments explained
Update Credit Card or Direct Debit payment details or Re-try a Failed Payment securely online
Feel free to reach out to us again should you require further assistance.
... View more