the email received from cancelation team is misleading.
it suggests :
Thank you for your recent contact with TPG. We are sorry to hear you wish to cancel your internet and/or home phone service.
To proceed with cancellation, submit your request online by logging in to TPG My Account at https://www.tpg.com.au/account and clicking Cancel Your Service.
i am trying to cancel my 5G home internet service
There is no "Cancel Your Service" option available after logging in to account but the email received from TPG suggests this step.